diff --git a/.eslintrc.json b/.eslintrc.json
index a08b5bd52..6b72d306d 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -12,6 +12,15 @@
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+        "varsIgnorePattern": "^_",
+        "caughtErrorsIgnorePattern": "^_",
+        "ignoreRestSiblings": true
+      }
+    ],
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       {
diff --git a/package-lock.json b/package-lock.json
index fa2d2213f..897355585 100644
--- a/package-lock.json
+++ b/package-lock.json
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-    "node_modules/serve-static": {
-      "version": "1.16.2",
-      "resolved": "https://registry.npmjs.org/serve-static/-/serve-static-1.16.2.tgz",
-      "integrity": "sha512-VqpjJZKadQB/PEbEwvFdO43Ax5dFBZ2UECszz8bQ7pi7wt//PWe1P6MN7eCnjsatYtBT6EuiClbjSWP2WrIoTw==",
-      "dev": true,
-      "peer": true,
-      "dependencies": {
-        "encodeurl": "~2.0.0",
-        "escape-html": "~1.0.3",
-        "parseurl": "~1.3.3",
-        "send": "0.19.0"
-      },
-      "engines": {
-        "node": ">= 0.8.0"
-      }
-    },
     "node_modules/set-function-length": {
       "version": "1.2.2",
       "resolved": "https://registry.npmjs.org/set-function-length/-/set-function-length-1.2.2.tgz",
@@ -17190,34 +16480,6 @@
       "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A==",
       "dev": true
     },
-    "node_modules/terser": {
-      "version": "5.31.6",
-      "resolved": "https://registry.npmjs.org/terser/-/terser-5.31.6.tgz",
-      "integrity": "sha512-PQ4DAriWzKj+qgehQ7LK5bQqCFNMmlhjR2PFFLuqGCpuCAauxemVBWwWOxo3UIwWQx8+Pr61Df++r76wDmkQBg==",
-      "dev": true,
-      "optional": true,
-      "peer": true,
-      "dependencies": {
-        "@jridgewell/source-map": "^0.3.3",
-        "acorn": "^8.8.2",
-        "commander": "^2.20.0",
-        "source-map-support": "~0.5.20"
-      },
-      "bin": {
-        "terser": "bin/terser"
-      },
-      "engines": {
-        "node": ">=10"
-      }
-    },
-    "node_modules/terser/node_modules/commander": {
-      "version": "2.20.3",
-      "resolved": "https://registry.npmjs.org/commander/-/commander-2.20.3.tgz",
-      "integrity": "sha512-GpVkmM8vF2vQUkj2LvZmD35JxeJOLCwJ9cUkugyk2nuhbv3+mJvpLYYt+0+USMxE+oj+ey/lJEnhZw75x/OMcQ==",
-      "dev": true,
-      "optional": true,
-      "peer": true
-    },
     "node_modules/test-exclude": {
       "version": "6.0.0",
       "resolved": "https://registry.npmjs.org/test-exclude/-/test-exclude-6.0.0.tgz",
@@ -17985,16 +17247,6 @@
       "integrity": "sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw==",
       "dev": true
     },
-    "node_modules/utils-merge": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
-      "integrity": "sha512-pMZTvIkT1d+TFGvDOqodOclx0QWkkgi6Tdoa8gC8ffGAAqz9pzPTZWAybbsHHoED/ztMtkv/VoYTYyShUn81hA==",
-      "dev": true,
-      "peer": true,
-      "engines": {
-        "node": ">= 0.4.0"
-      }
-    },
     "node_modules/uuid": {
       "version": "11.1.0",
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-11.1.0.tgz",
@@ -21363,34 +20615,6 @@
         "url": "https://github.com/chalk/strip-ansi?sponsor=1"
       }
     },
-    "packages/angular/node_modules/terser": {
-      "version": "5.36.0",
-      "resolved": "https://registry.npmjs.org/terser/-/terser-5.36.0.tgz",
-      "integrity": "sha512-IYV9eNMuFAV4THUspIRXkLakHnV6XO7FEdtKjf/mDyrnqUg9LnlOn6/RwRvM9SZjR4GUq8Nk8zj67FzVARr74w==",
-      "dev": true,
-      "optional": true,
-      "peer": true,
-      "dependencies": {
-        "@jridgewell/source-map": "^0.3.3",
-        "acorn": "^8.8.2",
-        "commander": "^2.20.0",
-        "source-map-support": "~0.5.20"
-      },
-      "bin": {
-        "terser": "bin/terser"
-      },
-      "engines": {
-        "node": ">=10"
-      }
-    },
-    "packages/angular/node_modules/terser/node_modules/commander": {
-      "version": "2.20.3",
-      "resolved": "https://registry.npmjs.org/commander/-/commander-2.20.3.tgz",
-      "integrity": "sha512-GpVkmM8vF2vQUkj2LvZmD35JxeJOLCwJ9cUkugyk2nuhbv3+mJvpLYYt+0+USMxE+oj+ey/lJEnhZw75x/OMcQ==",
-      "dev": true,
-      "optional": true,
-      "peer": true
-    },
     "packages/angular/node_modules/tough-cookie": {
       "version": "5.1.2",
       "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-5.1.2.tgz",
diff --git a/packages/server/README.md b/packages/server/README.md
index d1638c8ce..0966db4ac 100644
--- a/packages/server/README.md
+++ b/packages/server/README.md
@@ -140,7 +140,83 @@ OpenFeature.setProvider(new MyProvider());
 Once the provider has been registered, the status can be tracked using [events](#eventing).
 
 In some situations, it may be beneficial to register multiple providers in the same application.
-This is possible using [domains](#domains), which is covered in more details below.
+This is possible using [domains](#domains), which is covered in more detail below.
+
+#### Multi-Provider
+
+The Multi-Provider allows you to use multiple underlying providers as sources of flag data for the OpenFeature server SDK. When a flag is being evaluated, the Multi-Provider will consult each underlying provider it is managing in order to determine the final result. Different evaluation strategies can be defined to control which providers get evaluated and which result is used.
+
+The Multi-Provider is a powerful tool for performing migrations between flag providers, or combining multiple providers into a single feature flagging interface. For example:
+
+- **Migration**: Gradually migrate from one provider to another by serving some flags from your old provider and some from your new provider
+- **Backup**: Use one provider as a backup for another in case of failures
+- **Comparison**: Compare results from multiple providers to validate consistency
+- **Hybrid**: Combine multiple providers to leverage different strengths (e.g., one for simple flags, another for complex targeting)
+
+```ts
+import { OpenFeature, MultiProvider, FirstMatchStrategy } from '@openfeature/server-sdk';
+
+// Create providers
+const primaryProvider = new YourPrimaryProvider();
+const backupProvider = new YourBackupProvider();
+
+// Create multi-provider with a strategy
+const multiProvider = new MultiProvider(
+  [primaryProvider, backupProvider],
+  new FirstMatchStrategy()
+);
+
+// Register the multi-provider
+await OpenFeature.setProviderAndWait(multiProvider);
+
+// Use as normal
+const client = OpenFeature.getClient();
+const value = await client.getBooleanValue('my-flag', false);
+```
+
+**Available Strategies:**
+
+- `FirstMatchStrategy`: Returns the first successful result from the list of providers
+- `ComparisonStrategy`: Compares results from multiple providers and can handle discrepancies
+
+**Migration Example:**
+
+```ts
+import { OpenFeature, MultiProvider, FirstMatchStrategy } from '@openfeature/server-sdk';
+
+// During migration, serve some flags from the new provider and fallback to the old one
+const newProvider = new NewFlagProvider();
+const oldProvider = new OldFlagProvider();
+
+const multiProvider = new MultiProvider(
+  [newProvider, oldProvider], // New provider is consulted first
+  new FirstMatchStrategy()
+);
+
+await OpenFeature.setProviderAndWait(multiProvider);
+```
+
+**Comparison Example:**
+
+```ts
+import { OpenFeature, MultiProvider, ComparisonStrategy } from '@openfeature/server-sdk';
+
+// Compare results from two providers for validation
+const providerA = new ProviderA();
+const providerB = new ProviderB();
+
+const multiProvider = new MultiProvider(
+  [
+    { provider: providerA },
+    { provider: providerB }
+  ],
+  new ComparisonStrategy(providerA, (resolutions) => {
+    console.warn('Mismatch detected', resolutions);
+  })
+);
+
+await OpenFeature.setProviderAndWait(multiProvider);
+```
 
 ### Targeting
 
diff --git a/packages/server/src/provider/index.ts b/packages/server/src/provider/index.ts
index 33e12fea3..ca2771629 100644
--- a/packages/server/src/provider/index.ts
+++ b/packages/server/src/provider/index.ts
@@ -1,3 +1,4 @@
 export * from './provider';
 export * from './no-op-provider';
 export * from './in-memory-provider';
+export * from './multi-provider';
diff --git a/packages/server/src/provider/multi-provider/README.md b/packages/server/src/provider/multi-provider/README.md
new file mode 100644
index 000000000..7543c236b
--- /dev/null
+++ b/packages/server/src/provider/multi-provider/README.md
@@ -0,0 +1,185 @@
+# OpenFeature Multi-Provider
+
+The Multi-Provider allows you to use multiple underlying providers as sources of flag data for the OpenFeature server SDK.
+When a flag is being evaluated, the Multi-Provider will consult each underlying provider it is managing in order to determine
+the final result. Different evaluation strategies can be defined to control which providers get evaluated and which result is used.
+
+The Multi-Provider is a powerful tool for performing migrations between flag providers, or combining multiple providers into a single
+feature flagging interface. For example:
+
+- *Migration*: When migrating between two providers, you can run both in parallel under a unified flagging interface. As flags are added to the
+new provider, the Multi-Provider will automatically find and return them, falling back to the old provider if the new provider does not have
+- *Multiple Data Sources*: The Multi-Provider allows you to seamlessly combine many sources of flagging data, such as environment variables,
+local files, database values and SaaS hosted feature management systems.
+
+## Usage
+
+The Multi-Provider is initialized with an array of providers it should evaluate:
+
+```typescript
+import { MultiProvider } from '@openfeature/server-sdk'
+import { OpenFeature } from '@openfeature/server-sdk'
+
+const multiProvider = new MultiProvider([
+  { provider: new ProviderA() },
+  { provider: new ProviderB() }
+])
+
+await OpenFeature.setProviderAndWait(multiProvider)
+
+const client = OpenFeature.getClient()
+
+console.log("Evaluating flag")
+console.log(await client.getBooleanDetails("my-flag", false));
+```
+
+By default, the Multi-Provider will evaluate all underlying providers in order and return the first successful result. If a provider indicates
+it does not have a flag (FLAG_NOT_FOUND error code), then it will be skipped and the next provider will be evaluated. If any provider throws
+or returns an error result, the operation will fail and the error will be thrown. If no provider returns a successful result, the operation
+will fail with a FLAG_NOT_FOUND error code.
+
+To change this behaviour, a different "strategy" can be provided:
+
+```typescript
+import { MultiProvider, FirstSuccessfulStrategy } from '@openfeature/server-sdk'
+
+const multiProvider = new MultiProvider(
+    [
+      { provider: new ProviderA() },
+      { provider: new ProviderB() }
+    ], 
+    new FirstSuccessfulStrategy()
+)
+```
+
+## Strategies
+
+The Multi-Provider comes with three strategies out of the box:
+
+- `FirstMatchStrategy` (default): Evaluates all providers in order and returns the first successful result. Providers that indicate FLAG_NOT_FOUND error will be skipped and the next provider will be evaluated. Any other error will cause the operation to fail and the set of errors to be thrown.
+- `FirstSuccessfulStrategy`: Evaluates all providers in order and returns the first successful result. Any error will cause that provider to be skipped.
+If no successful result is returned, the set of errors will be thrown.
+- `ComparisonStrategy`: Evaluates all providers in parallel. If every provider returns a successful result with the same value, then that result is returned.
+Otherwise, the result returned by the configured "fallback provider" will be used. When values do not agree, an optional callback will be executed to notify
+you of the mismatch. This can be useful when migrating between providers that are expected to contain identical configuration. You can easily spot mismatches
+in configuration without affecting flag behaviour.
+
+This strategy accepts several arguments during initialization:
+
+```typescript
+import { MultiProvider, ComparisonStrategy } from '@openfeature/server-sdk'
+
+const providerA = new ProviderA()
+const multiProvider = new MultiProvider(
+  [
+    { provider: providerA },
+    { provider: new ProviderB() }
+  ],
+  new ComparisonStrategy(providerA, (details) => {
+      console.log("Mismatch detected", details)
+  })
+)
+```
+
+The first argument is the "fallback provider" whose value to use in the event that providers do not agree. It should be the same object reference as one of the providers in the list. The second argument is a callback function that will be executed when a mismatch is detected. The callback will be passed an object containing the details of each provider's resolution, including the flag key, the value returned, and any errors that were thrown.
+
+## Tracking Support
+
+The Multi-Provider supports tracking events across multiple providers. When you call the `track` method, it will by default send the tracking event to all underlying providers that implement the `track` method.
+
+```typescript
+import { OpenFeature } from '@openfeature/server-sdk'
+import { MultiProvider } from '@openfeature/server-sdk'
+
+const multiProvider = new MultiProvider([
+  { provider: new ProviderA() },
+  { provider: new ProviderB() }
+])
+
+await OpenFeature.setProviderAndWait(multiProvider)
+const client = OpenFeature.getClient()
+
+// Tracked events will be sent to all providers by default
+client.track('purchase', { targetingKey: 'user123' }, { value: 99.99, currency: 'USD' })
+```
+
+### Tracking Behavior
+
+- **Default**: All providers receive tracking calls by default
+- **Error Handling**: If one provider fails to track, others continue normally and errors are logged
+- **Provider Status**: Providers in `NOT_READY` or `FATAL` status are automatically skipped
+- **Optional Method**: Providers without a `track` method are gracefully skipped
+
+### Customizing Tracking with Strategies
+
+You can customize which providers receive tracking calls by overriding the `shouldTrackWithThisProvider` method in your custom strategy:
+
+```typescript
+import { BaseEvaluationStrategy, StrategyPerProviderContext } from '@openfeature/server-sdk'
+
+class CustomTrackingStrategy extends BaseEvaluationStrategy {
+  shouldTrackWithThisProvider(
+    strategyContext: StrategyPerProviderContext,
+    context: EvaluationContext,
+    trackingEventName: string,
+    trackingEventDetails: TrackingEventDetails,
+  ): boolean {
+    // Only track with the primary provider
+    if (strategyContext.providerName === 'primary-provider') {
+      return true;
+    }
+    
+    // Skip tracking for analytics events on backup providers
+    if (trackingEventName.startsWith('analytics.')) {
+      return false;
+    }
+    
+    return super.shouldTrackWithThisProvider(strategyContext, context, trackingEventName, trackingEventDetails);
+  }
+}
+```
+
+## Custom Strategies
+
+It is also possible to implement your own strategy if the above options do not fit your use case. To do so, create a class which implements the "BaseEvaluationStrategy":
+
+```typescript
+export abstract class BaseEvaluationStrategy {
+    public runMode: 'parallel' | 'sequential' = 'sequential';
+
+    abstract shouldEvaluateThisProvider(strategyContext: StrategyPerProviderContext, evalContext: EvaluationContext): boolean;
+
+    abstract shouldEvaluateNextProvider<T extends FlagValue>(
+        strategyContext: StrategyPerProviderContext,
+        context: EvaluationContext,
+        result: ProviderResolutionResult<T>,
+    ): boolean;
+
+    abstract shouldTrackWithThisProvider(
+        strategyContext: StrategyPerProviderContext,
+        context: EvaluationContext,
+        trackingEventName: string,
+        trackingEventDetails: TrackingEventDetails,
+    ): boolean;
+
+    abstract determineFinalResult<T extends FlagValue>(
+        strategyContext: StrategyEvaluationContext,
+        context: EvaluationContext,
+        resolutions: ProviderResolutionResult<T>[],
+    ): FinalResult<T>;
+}
+```
+
+The `runMode` property determines whether the list of providers will be evaluated sequentially or in parallel.
+
+The `shouldEvaluateThisProvider` method is called just before a provider is evaluated by the Multi-Provider. If the function returns `false`, then
+the provider will be skipped instead of being evaluated. The function is called with details about the evaluation including the flag key and type.
+Check the type definitions for the full list.
+
+The `shouldEvaluateNextProvider` function is called after a provider is evaluated. If it returns `true`, the next provider in the sequence will be called,
+otherwise no more providers will be evaluated. It is called with the same data as `shouldEvaluateThisProvider` as well as the details about the evaluation result. This function is not called when the `runMode` is `parallel`.
+
+The `shouldTrackWithThisProvider` method is called before sending a tracking event to each provider. Return `false` to skip tracking with that provider. By default, it only tracks with providers that are in a ready state (not `NOT_READY` or `FATAL`). Override this method to implement custom tracking logic based on the tracking event name, details, or provider characteristics.
+
+The `determineFinalResult` function is called after all providers have been called, or the `shouldEvaluateNextProvider` function returned false. It is called
+with a list of results from all the individual providers' evaluations. It returns the final decision for evaluation result, or throws an error if needed.
diff --git a/packages/server/src/provider/multi-provider/errors.ts b/packages/server/src/provider/multi-provider/errors.ts
new file mode 100644
index 000000000..f1f14438d
--- /dev/null
+++ b/packages/server/src/provider/multi-provider/errors.ts
@@ -0,0 +1,53 @@
+import type { ErrorCode } from '@openfeature/core';
+import { GeneralError, OpenFeatureError } from '@openfeature/core';
+import type { RegisteredProvider } from './types';
+
+export class ErrorWithCode extends OpenFeatureError {
+  constructor(
+    public code: ErrorCode,
+    message: string,
+  ) {
+    super(message);
+  }
+}
+
+export class AggregateError extends GeneralError {
+  constructor(
+    message: string,
+    public originalErrors: { source: string; error: unknown }[],
+  ) {
+    super(message);
+  }
+}
+
+export const constructAggregateError = (providerErrors: { error: unknown; providerName: string }[]) => {
+  const errorsWithSource = providerErrors
+    .map(({ providerName, error }) => {
+      return { source: providerName, error };
+    })
+    .flat();
+
+  // log first error in the message for convenience, but include all errors in the error object for completeness
+  return new AggregateError(
+    `Provider errors occurred: ${errorsWithSource[0].source}: ${errorsWithSource[0].error}`,
+    errorsWithSource,
+  );
+};
+
+export const throwAggregateErrorFromPromiseResults = (
+  result: PromiseSettledResult<unknown>[],
+  providerEntries: RegisteredProvider[],
+) => {
+  const errors = result
+    .map((r, i) => {
+      if (r.status === 'rejected') {
+        return { error: r.reason, providerName: providerEntries[i].name };
+      }
+      return null;
+    })
+    .filter((val): val is { error: unknown; providerName: string } => Boolean(val));
+
+  if (errors.length) {
+    throw constructAggregateError(errors);
+  }
+};
diff --git a/packages/server/src/provider/multi-provider/hook-executor.ts b/packages/server/src/provider/multi-provider/hook-executor.ts
new file mode 100644
index 000000000..55d085974
--- /dev/null
+++ b/packages/server/src/provider/multi-provider/hook-executor.ts
@@ -0,0 +1,70 @@
+import type { EvaluationDetails, FlagValue, HookContext, HookHints, Logger } from '@openfeature/core';
+import type { Hook } from '../../hooks';
+
+/**
+ * Utility for executing a set of hooks of each type. Implementation is largely copied from the main OpenFeature SDK.
+ */
+export class HookExecutor {
+  constructor(private logger: Logger) {}
+
+  async beforeHooks(hooks: Hook[] | undefined, hookContext: HookContext, hints: HookHints) {
+    for (const hook of hooks ?? []) {
+      // freeze the hookContext
+      Object.freeze(hookContext);
+
+      Object.assign(hookContext.context, {
+        ...(await hook?.before?.(hookContext, Object.freeze(hints))),
+      });
+    }
+
+    // after before hooks, freeze the EvaluationContext.
+    return Object.freeze(hookContext.context);
+  }
+
+  async afterHooks(
+    hooks: Hook[] | undefined,
+    hookContext: HookContext,
+    evaluationDetails: EvaluationDetails<FlagValue>,
+    hints: HookHints,
+  ) {
+    // run "after" hooks sequentially
+    for (const hook of hooks ?? []) {
+      await hook?.after?.(hookContext, evaluationDetails, hints);
+    }
+  }
+
+  async errorHooks(hooks: Hook[] | undefined, hookContext: HookContext, err: unknown, hints: HookHints) {
+    // run "error" hooks sequentially
+    for (const hook of hooks ?? []) {
+      try {
+        await hook?.error?.(hookContext, err, hints);
+      } catch (err) {
+        this.logger.error(`Unhandled error during 'error' hook: ${err}`);
+        if (err instanceof Error) {
+          this.logger.error(err.stack);
+        }
+        this.logger.error((err as Error)?.stack);
+      }
+    }
+  }
+
+  async finallyHooks(
+    hooks: Hook[] | undefined,
+    hookContext: HookContext,
+    evaluationDetails: EvaluationDetails<FlagValue>,
+    hints: HookHints,
+  ) {
+    // run "finally" hooks sequentially
+    for (const hook of hooks ?? []) {
+      try {
+        await hook?.finally?.(hookContext, evaluationDetails, hints);
+      } catch (err) {
+        this.logger.error(`Unhandled error during 'finally' hook: ${err}`);
+        if (err instanceof Error) {
+          this.logger.error(err.stack);
+        }
+        this.logger.error((err as Error)?.stack);
+      }
+    }
+  }
+}
diff --git a/packages/server/src/provider/multi-provider/index.ts b/packages/server/src/provider/multi-provider/index.ts
new file mode 100644
index 000000000..e7c2b3828
--- /dev/null
+++ b/packages/server/src/provider/multi-provider/index.ts
@@ -0,0 +1,3 @@
+export * from './multi-provider';
+export * from './errors';
+export * from './strategies';
diff --git a/packages/server/src/provider/multi-provider/multi-provider.ts b/packages/server/src/provider/multi-provider/multi-provider.ts
new file mode 100644
index 000000000..998c9149c
--- /dev/null
+++ b/packages/server/src/provider/multi-provider/multi-provider.ts
@@ -0,0 +1,361 @@
+import type {
+  BeforeHookContext,
+  EvaluationContext,
+  EvaluationDetails,
+  FlagMetadata,
+  FlagValue,
+  FlagValueType,
+  HookContext,
+  HookHints,
+  JsonValue,
+  Logger,
+  OpenFeatureError,
+  ProviderMetadata,
+  ResolutionDetails,
+  TrackingEventDetails,
+} from '@openfeature/core';
+import { DefaultLogger, ErrorCode, GeneralError, StandardResolutionReasons } from '@openfeature/core';
+import type { Provider } from '../provider';
+import type { Hook } from '../../hooks';
+import { OpenFeatureEventEmitter } from '../../events/open-feature-event-emitter';
+import { constructAggregateError, throwAggregateErrorFromPromiseResults } from './errors';
+import { HookExecutor } from './hook-executor';
+import { StatusTracker } from './status-tracker';
+import type { BaseEvaluationStrategy, ProviderResolutionResult } from './strategies';
+import { FirstMatchStrategy } from './strategies';
+import type { ProviderEntryInput, RegisteredProvider } from './types';
+
+export class MultiProvider implements Provider {
+  readonly runsOn = 'server';
+
+  public readonly events = new OpenFeatureEventEmitter();
+
+  private hookContexts: WeakMap<EvaluationContext, HookContext> = new WeakMap<EvaluationContext, HookContext>();
+  private hookHints: WeakMap<EvaluationContext, HookHints> = new WeakMap<EvaluationContext, HookHints>();
+
+  metadata: ProviderMetadata;
+
+  providerEntries: RegisteredProvider[] = [];
+  private providerEntriesByName: Record<string, RegisteredProvider> = {};
+
+  private hookExecutor: HookExecutor;
+  private statusTracker = new StatusTracker(this.events);
+
+  constructor(
+    readonly constructorProviders: ProviderEntryInput[],
+    private readonly evaluationStrategy: BaseEvaluationStrategy = new FirstMatchStrategy(),
+    private readonly logger: Logger = new DefaultLogger(),
+  ) {
+    this.hookExecutor = new HookExecutor(this.logger);
+
+    this.registerProviders(constructorProviders);
+
+    const aggregateMetadata = Object.keys(this.providerEntriesByName).reduce((acc, name) => {
+      return { ...acc, [name]: this.providerEntriesByName[name].provider.metadata };
+    }, {});
+
+    this.metadata = {
+      ...aggregateMetadata,
+      name: MultiProvider.name,
+    };
+  }
+
+  private registerProviders(constructorProviders: ProviderEntryInput[]) {
+    const providersByName: Record<string, Provider[]> = {};
+
+    for (const constructorProvider of constructorProviders) {
+      const providerName = constructorProvider.provider.metadata.name;
+      const candidateName = constructorProvider.name ?? providerName;
+
+      if (constructorProvider.name && providersByName[constructorProvider.name]) {
+        throw new Error('Provider names must be unique');
+      }
+
+      providersByName[candidateName] ??= [];
+      providersByName[candidateName].push(constructorProvider.provider);
+    }
+
+    for (const name of Object.keys(providersByName)) {
+      const useIndexedNames = providersByName[name].length > 1;
+      for (let i = 0; i < providersByName[name].length; i++) {
+        const indexedName = useIndexedNames ? `${name}-${i + 1}` : name;
+        this.providerEntriesByName[indexedName] = { provider: providersByName[name][i], name: indexedName };
+        this.providerEntries.push(this.providerEntriesByName[indexedName]);
+        this.statusTracker.wrapEventHandler(this.providerEntriesByName[indexedName]);
+      }
+    }
+
+    // just make sure we don't accidentally modify these later
+    Object.freeze(this.providerEntries);
+    Object.freeze(this.providerEntriesByName);
+  }
+
+  async initialize(context?: EvaluationContext): Promise<void> {
+    const result = await Promise.allSettled(
+      this.providerEntries.map((provider) => provider.provider.initialize?.(context)),
+    );
+    throwAggregateErrorFromPromiseResults(result, this.providerEntries);
+  }
+
+  async onClose(): Promise<void> {
+    const result = await Promise.allSettled(this.providerEntries.map((provider) => provider.provider.onClose?.()));
+    throwAggregateErrorFromPromiseResults(result, this.providerEntries);
+  }
+
+  resolveBooleanEvaluation(
+    flagKey: string,
+    defaultValue: boolean,
+    context: EvaluationContext,
+  ): Promise<ResolutionDetails<boolean>> {
+    return this.flagResolutionProxy<boolean>(flagKey, 'boolean', defaultValue, context);
+  }
+
+  resolveStringEvaluation(
+    flagKey: string,
+    defaultValue: string,
+    context: EvaluationContext,
+  ): Promise<ResolutionDetails<string>> {
+    return this.flagResolutionProxy(flagKey, 'string', defaultValue, context);
+  }
+
+  resolveNumberEvaluation(
+    flagKey: string,
+    defaultValue: number,
+    context: EvaluationContext,
+  ): Promise<ResolutionDetails<number>> {
+    return this.flagResolutionProxy(flagKey, 'number', defaultValue, context);
+  }
+
+  resolveObjectEvaluation<U extends JsonValue>(
+    flagKey: string,
+    defaultValue: U,
+    context: EvaluationContext,
+  ): Promise<ResolutionDetails<U>> {
+    return this.flagResolutionProxy(flagKey, 'object', defaultValue, context);
+  }
+
+  private async flagResolutionProxy<T extends boolean | string | number | JsonValue>(
+    flagKey: string,
+    flagType: FlagValueType,
+    defaultValue: T,
+    context: EvaluationContext,
+  ): Promise<ResolutionDetails<T>> {
+    const hookContext = this.hookContexts.get(context);
+    const hookHints = this.hookHints.get(context);
+
+    if (!hookContext || !hookHints) {
+      throw new GeneralError('Hook context not available for evaluation');
+    }
+
+    const tasks: Promise<[boolean, ProviderResolutionResult<T> | null]>[] = [];
+
+    for (const providerEntry of this.providerEntries) {
+      const task = this.evaluateProviderEntry(
+        flagKey,
+        flagType,
+        defaultValue,
+        providerEntry,
+        hookContext,
+        hookHints,
+        context,
+      );
+
+      tasks.push(task);
+
+      if (this.evaluationStrategy.runMode === 'sequential') {
+        const [shouldEvaluateNext] = await task;
+        if (!shouldEvaluateNext) {
+          break;
+        }
+      }
+    }
+
+    const results = await Promise.all(tasks);
+    const resolutions = results
+      .map(([, resolution]) => resolution)
+      .filter((r): r is ProviderResolutionResult<T> => Boolean(r));
+
+    const finalResult = this.evaluationStrategy.determineFinalResult({ flagKey, flagType }, context, resolutions);
+
+    if (finalResult.errors?.length) {
+      throw constructAggregateError(finalResult.errors);
+    }
+
+    if (!finalResult.details) {
+      throw new GeneralError('No result was returned from any provider');
+    }
+
+    return finalResult.details;
+  }
+
+  private async evaluateProviderEntry<T extends boolean | string | number | JsonValue>(
+    flagKey: string,
+    flagType: FlagValueType,
+    defaultValue: T,
+    providerEntry: RegisteredProvider,
+    hookContext: HookContext,
+    hookHints: HookHints,
+    context: EvaluationContext,
+  ): Promise<[boolean, ProviderResolutionResult<T> | null]> {
+    let evaluationResult: ResolutionDetails<T> | undefined = undefined;
+    const provider = providerEntry.provider;
+    const strategyContext = {
+      flagKey,
+      flagType,
+      provider,
+      providerName: providerEntry.name,
+      providerStatus: this.statusTracker.providerStatus(providerEntry.name),
+    };
+
+    if (!this.evaluationStrategy.shouldEvaluateThisProvider(strategyContext, context)) {
+      return [true, null];
+    }
+
+    let resolution: ProviderResolutionResult<T>;
+
+    try {
+      evaluationResult = await this.evaluateProviderAndHooks(flagKey, defaultValue, provider, hookContext, hookHints);
+      resolution = {
+        details: evaluationResult,
+        provider: provider,
+        providerName: providerEntry.name,
+      };
+    } catch (error: unknown) {
+      resolution = {
+        thrownError: error,
+        provider: provider,
+        providerName: providerEntry.name,
+      };
+    }
+
+    return [
+      this.evaluationStrategy.runMode === 'sequential'
+        ? this.evaluationStrategy.shouldEvaluateNextProvider(strategyContext, context, resolution)
+        : true,
+      resolution,
+    ];
+  }
+
+  private async evaluateProviderAndHooks<T extends boolean | string | number | JsonValue>(
+    flagKey: string,
+    defaultValue: T,
+    provider: Provider,
+    hookContext: HookContext,
+    hookHints: HookHints,
+  ) {
+    let providerContext: EvaluationContext | undefined = undefined;
+    let evaluationDetails: EvaluationDetails<T>;
+
+    // create a copy of the shared hook context because we're going to mutate the evaluation context
+    const hookContextCopy = { ...hookContext, context: { ...hookContext.context } };
+
+    try {
+      // return the modified provider context and mutate the hook context to contain it
+      providerContext = await this.hookExecutor.beforeHooks(provider.hooks, hookContextCopy, hookHints);
+
+      const resolutionDetails = (await this.callProviderResolve(
+        provider,
+        flagKey,
+        defaultValue,
+        providerContext || {},
+      )) as ResolutionDetails<T>;
+
+      evaluationDetails = {
+        ...resolutionDetails,
+        flagMetadata: Object.freeze(resolutionDetails.flagMetadata ?? {}),
+        flagKey,
+      };
+
+      await this.hookExecutor.afterHooks(provider.hooks, hookContextCopy, evaluationDetails, hookHints);
+    } catch (error: unknown) {
+      await this.hookExecutor.errorHooks(provider.hooks, hookContextCopy, error, hookHints);
+      evaluationDetails = this.getErrorEvaluationDetails(flagKey, defaultValue, error);
+    }
+    await this.hookExecutor.finallyHooks(provider.hooks, hookContextCopy, evaluationDetails, hookHints);
+    return evaluationDetails;
+  }
+
+  private async callProviderResolve<T extends boolean | string | number | JsonValue>(
+    provider: Provider,
+    flagKey: string,
+    defaultValue: T,
+    context: EvaluationContext,
+  ) {
+    switch (typeof defaultValue) {
+      case 'string':
+        return await provider.resolveStringEvaluation(flagKey, defaultValue, context, this.logger);
+      case 'number':
+        return await provider.resolveNumberEvaluation(flagKey, defaultValue, context, this.logger);
+      case 'object':
+        return await provider.resolveObjectEvaluation(flagKey, defaultValue, context, this.logger);
+      case 'boolean':
+        return await provider.resolveBooleanEvaluation(flagKey, defaultValue, context, this.logger);
+      default:
+        throw new GeneralError('Invalid flag evaluation type');
+    }
+  }
+
+  public get hooks(): Hook[] {
+    return [
+      {
+        before: async (hookContext: BeforeHookContext, hints: HookHints): Promise<EvaluationContext> => {
+          this.hookContexts.set(hookContext.context, hookContext);
+          this.hookHints.set(hookContext.context, hints ?? {});
+          return hookContext.context;
+        },
+      },
+    ];
+  }
+
+  track(trackingEventName: string, context: EvaluationContext, trackingEventDetails: TrackingEventDetails): void {
+    for (const providerEntry of this.providerEntries) {
+      if (!providerEntry.provider.track) {
+        continue;
+      }
+
+      const strategyContext = {
+        provider: providerEntry.provider,
+        providerName: providerEntry.name,
+        providerStatus: this.statusTracker.providerStatus(providerEntry.name),
+      };
+
+      if (
+        this.evaluationStrategy.shouldTrackWithThisProvider(
+          strategyContext,
+          context,
+          trackingEventName,
+          trackingEventDetails,
+        )
+      ) {
+        try {
+          providerEntry.provider.track?.(trackingEventName, context, trackingEventDetails);
+        } catch (error) {
+          // Log error but don't throw - tracking shouldn't break application flow
+          this.logger.error(
+            `Error tracking event "${trackingEventName}" with provider "${providerEntry.name}":`,
+            error,
+          );
+        }
+      }
+    }
+  }
+
+  private getErrorEvaluationDetails<T extends FlagValue>(
+    flagKey: string,
+    defaultValue: T,
+    err: unknown,
+    flagMetadata: FlagMetadata = {},
+  ): EvaluationDetails<T> {
+    const errorMessage: string = (err as Error)?.message;
+    const errorCode: ErrorCode = (err as OpenFeatureError)?.code || ErrorCode.GENERAL;
+
+    return {
+      errorCode,
+      errorMessage,
+      value: defaultValue,
+      reason: StandardResolutionReasons.ERROR,
+      flagMetadata: Object.freeze(flagMetadata),
+      flagKey,
+    };
+  }
+}
diff --git a/packages/server/src/provider/multi-provider/status-tracker.ts b/packages/server/src/provider/multi-provider/status-tracker.ts
new file mode 100644
index 000000000..b06bd054d
--- /dev/null
+++ b/packages/server/src/provider/multi-provider/status-tracker.ts
@@ -0,0 +1,67 @@
+import type { EventDetails } from '@openfeature/core';
+import type { OpenFeatureEventEmitter } from '../../events';
+import { ProviderEvents } from '../../events';
+import { ProviderStatus } from '../provider';
+import type { RegisteredProvider } from './types';
+
+/**
+ * Tracks each individual provider's status by listening to emitted events
+ * Maintains an overall "status" for the multi provider which represents the "most critical" status out of all providers
+ */
+export class StatusTracker {
+  private readonly providerStatuses: Record<string, ProviderStatus> = {};
+
+  constructor(private events: OpenFeatureEventEmitter) {}
+
+  wrapEventHandler(providerEntry: RegisteredProvider) {
+    const provider = providerEntry.provider;
+    provider.events?.addHandler(ProviderEvents.Error, (details?: EventDetails) => {
+      this.changeProviderStatus(providerEntry.name, ProviderStatus.ERROR, details);
+    });
+
+    provider.events?.addHandler(ProviderEvents.Stale, (details?: EventDetails) => {
+      this.changeProviderStatus(providerEntry.name, ProviderStatus.STALE, details);
+    });
+
+    provider.events?.addHandler(ProviderEvents.ConfigurationChanged, (details?: EventDetails) => {
+      this.events.emit(ProviderEvents.ConfigurationChanged, details);
+    });
+
+    provider.events?.addHandler(ProviderEvents.Ready, (details?: EventDetails) => {
+      this.changeProviderStatus(providerEntry.name, ProviderStatus.READY, details);
+    });
+  }
+
+  providerStatus(name: string) {
+    return this.providerStatuses[name];
+  }
+
+  private getStatusFromProviderStatuses() {
+    const statuses = Object.values(this.providerStatuses);
+    if (statuses.includes(ProviderStatus.FATAL)) {
+      return ProviderStatus.FATAL;
+    } else if (statuses.includes(ProviderStatus.NOT_READY)) {
+      return ProviderStatus.NOT_READY;
+    } else if (statuses.includes(ProviderStatus.ERROR)) {
+      return ProviderStatus.ERROR;
+    } else if (statuses.includes(ProviderStatus.STALE)) {
+      return ProviderStatus.STALE;
+    }
+    return ProviderStatus.READY;
+  }
+
+  private changeProviderStatus(name: string, status: ProviderStatus, details?: EventDetails) {
+    const currentStatus = this.getStatusFromProviderStatuses();
+    this.providerStatuses[name] = status;
+    const newStatus = this.getStatusFromProviderStatuses();
+    if (currentStatus !== newStatus) {
+      if (newStatus === ProviderStatus.FATAL || newStatus === ProviderStatus.ERROR) {
+        this.events.emit(ProviderEvents.Error, details);
+      } else if (newStatus === ProviderStatus.STALE) {
+        this.events.emit(ProviderEvents.Stale, details);
+      } else if (newStatus === ProviderStatus.READY) {
+        this.events.emit(ProviderEvents.Ready, details);
+      }
+    }
+  }
+}
diff --git a/packages/server/src/provider/multi-provider/strategies/base-evaluation-strategy.ts b/packages/server/src/provider/multi-provider/strategies/base-evaluation-strategy.ts
new file mode 100644
index 000000000..cb74993cc
--- /dev/null
+++ b/packages/server/src/provider/multi-provider/strategies/base-evaluation-strategy.ts
@@ -0,0 +1,130 @@
+import type {
+  ErrorCode,
+  EvaluationContext,
+  FlagValue,
+  FlagValueType,
+  OpenFeatureError,
+  ResolutionDetails,
+  TrackingEventDetails,
+} from '@openfeature/core';
+import type { Provider } from '../../provider';
+import { ProviderStatus } from '../../provider';
+import { ErrorWithCode } from '../errors';
+
+export type StrategyEvaluationContext = {
+  flagKey: string;
+  flagType: FlagValueType;
+};
+export type StrategyProviderContext = {
+  provider: Provider;
+  providerName: string;
+  providerStatus: ProviderStatus;
+};
+export type StrategyPerProviderContext = StrategyEvaluationContext & StrategyProviderContext;
+
+type ProviderResolutionResultBase = {
+  provider: Provider;
+  providerName: string;
+};
+
+export type ProviderResolutionSuccessResult<T extends FlagValue> = ProviderResolutionResultBase & {
+  details: ResolutionDetails<T>;
+};
+
+export type ProviderResolutionErrorResult = ProviderResolutionResultBase & {
+  thrownError: unknown;
+};
+
+export type ProviderResolutionResult<T extends FlagValue> =
+  | ProviderResolutionSuccessResult<T>
+  | ProviderResolutionErrorResult;
+
+export type FinalResult<T extends FlagValue> = {
+  details?: ResolutionDetails<T>;
+  provider?: Provider;
+  providerName?: string;
+  errors?: {
+    providerName: string;
+    error: unknown;
+  }[];
+};
+
+/**
+ * Base strategy to inherit from. Not directly usable, as strategies must implement the "determineResult" method
+ * Contains default implementations for `shouldEvaluateThisProvider` and `shouldEvaluateNextProvider`
+ */
+export abstract class BaseEvaluationStrategy {
+  public runMode: 'parallel' | 'sequential' = 'sequential';
+
+  shouldEvaluateThisProvider(strategyContext: StrategyPerProviderContext, _evalContext?: EvaluationContext): boolean {
+    if (
+      strategyContext.providerStatus === ProviderStatus.NOT_READY ||
+      strategyContext.providerStatus === ProviderStatus.FATAL
+    ) {
+      return false;
+    }
+    return true;
+  }
+
+  shouldEvaluateNextProvider<T extends FlagValue>(
+    _strategyContext?: StrategyPerProviderContext,
+    _context?: EvaluationContext,
+    _result?: ProviderResolutionResult<T>,
+  ): boolean {
+    return true;
+  }
+
+  shouldTrackWithThisProvider(
+    strategyContext: StrategyProviderContext,
+    _context?: EvaluationContext,
+    _trackingEventName?: string,
+    _trackingEventDetails?: TrackingEventDetails,
+  ): boolean {
+    if (
+      strategyContext.providerStatus === ProviderStatus.NOT_READY ||
+      strategyContext.providerStatus === ProviderStatus.FATAL
+    ) {
+      return false;
+    }
+    return true;
+  }
+
+  abstract determineFinalResult<T extends FlagValue>(
+    strategyContext: StrategyEvaluationContext,
+    context: EvaluationContext,
+    resolutions: ProviderResolutionResult<T>[],
+  ): FinalResult<T>;
+
+  protected hasError(resolution: ProviderResolutionResult<FlagValue>): resolution is
+    | ProviderResolutionErrorResult
+    | (ProviderResolutionSuccessResult<FlagValue> & {
+        details: ResolutionDetails<FlagValue> & { errorCode: ErrorCode };
+      }) {
+    return 'thrownError' in resolution || !!resolution.details.errorCode;
+  }
+
+  protected hasErrorWithCode(resolution: ProviderResolutionResult<FlagValue>, code: ErrorCode): boolean {
+    return 'thrownError' in resolution
+      ? (resolution.thrownError as OpenFeatureError)?.code === code
+      : resolution.details.errorCode === code;
+  }
+
+  protected collectProviderErrors<T extends FlagValue>(resolutions: ProviderResolutionResult<T>[]): FinalResult<T> {
+    const errors: FinalResult<FlagValue>['errors'] = [];
+    for (const resolution of resolutions) {
+      if ('thrownError' in resolution) {
+        errors.push({ providerName: resolution.providerName, error: resolution.thrownError });
+      } else if (resolution.details.errorCode) {
+        errors.push({
+          providerName: resolution.providerName,
+          error: new ErrorWithCode(resolution.details.errorCode, resolution.details.errorMessage ?? 'unknown error'),
+        });
+      }
+    }
+    return { errors };
+  }
+
+  protected resolutionToFinalResult<T extends FlagValue>(resolution: ProviderResolutionSuccessResult<T>) {
+    return { details: resolution.details, provider: resolution.provider, providerName: resolution.providerName };
+  }
+}
diff --git a/packages/server/src/provider/multi-provider/strategies/comparison-strategy.ts b/packages/server/src/provider/multi-provider/strategies/comparison-strategy.ts
new file mode 100644
index 000000000..491c4cf3e
--- /dev/null
+++ b/packages/server/src/provider/multi-provider/strategies/comparison-strategy.ts
@@ -0,0 +1,72 @@
+import type {
+  FinalResult,
+  ProviderResolutionResult,
+  ProviderResolutionSuccessResult,
+  StrategyPerProviderContext,
+} from './base-evaluation-strategy';
+import { BaseEvaluationStrategy } from './base-evaluation-strategy';
+import type { EvaluationContext, FlagValue } from '@openfeature/core';
+import type { Provider } from '../../provider';
+import { GeneralError } from '@openfeature/core';
+
+/**
+ * Evaluate all providers in parallel and compare the results.
+ * If the values agree, return the value
+ * If the values disagree, return the value from the configured "fallback provider" and execute the "onMismatch"
+ * callback if defined
+ */
+export class ComparisonStrategy extends BaseEvaluationStrategy {
+  override runMode = 'parallel' as const;
+
+  constructor(
+    private fallbackProvider: Provider,
+    private onMismatch?: (resolutions: ProviderResolutionResult<FlagValue>[]) => void,
+  ) {
+    super();
+  }
+
+  override determineFinalResult<T extends FlagValue>(
+    strategyContext: StrategyPerProviderContext,
+    context: EvaluationContext,
+    resolutions: ProviderResolutionResult<T>[],
+  ): FinalResult<T> {
+    let value: T | undefined;
+    let fallbackResolution: ProviderResolutionSuccessResult<T> | undefined;
+    let finalResolution: ProviderResolutionSuccessResult<T> | undefined;
+    let mismatch = false;
+    for (const [i, resolution] of resolutions.entries()) {
+      if (this.hasError(resolution)) {
+        return this.collectProviderErrors(resolutions);
+      }
+      if (resolution.provider === this.fallbackProvider) {
+        fallbackResolution = resolution;
+      }
+      if (i === 0) {
+        finalResolution = resolution;
+      }
+      if (typeof value !== 'undefined' && value !== resolution.details.value) {
+        mismatch = true;
+      } else {
+        value = resolution.details.value;
+      }
+    }
+
+    if (!fallbackResolution) {
+      throw new GeneralError('Fallback provider not found in resolution results');
+    }
+
+    if (!finalResolution) {
+      throw new GeneralError('Final resolution not found in resolution results');
+    }
+
+    if (mismatch) {
+      this.onMismatch?.(resolutions);
+      return {
+        details: fallbackResolution.details,
+        provider: fallbackResolution.provider,
+      };
+    }
+
+    return this.resolutionToFinalResult(finalResolution);
+  }
+}
diff --git a/packages/server/src/provider/multi-provider/strategies/first-match-strategy.ts b/packages/server/src/provider/multi-provider/strategies/first-match-strategy.ts
new file mode 100644
index 000000000..375378d58
--- /dev/null
+++ b/packages/server/src/provider/multi-provider/strategies/first-match-strategy.ts
@@ -0,0 +1,36 @@
+import type { FinalResult, ProviderResolutionResult, StrategyPerProviderContext } from './base-evaluation-strategy';
+import { BaseEvaluationStrategy } from './base-evaluation-strategy';
+import type { EvaluationContext, FlagValue } from '@openfeature/core';
+import { ErrorCode } from '@openfeature/core';
+
+/**
+ * Return the first result that did not indicate "flag not found".
+ * If any provider in the course of evaluation returns or throws an error, throw that error
+ */
+export class FirstMatchStrategy extends BaseEvaluationStrategy {
+  override shouldEvaluateNextProvider<T extends FlagValue>(
+    strategyContext: StrategyPerProviderContext,
+    context: EvaluationContext,
+    result: ProviderResolutionResult<T>,
+  ): boolean {
+    if (this.hasErrorWithCode(result, ErrorCode.FLAG_NOT_FOUND)) {
+      return true;
+    }
+    if (this.hasError(result)) {
+      return false;
+    }
+    return false;
+  }
+
+  override determineFinalResult<T extends FlagValue>(
+    strategyContext: StrategyPerProviderContext,
+    context: EvaluationContext,
+    resolutions: ProviderResolutionResult<T>[],
+  ): FinalResult<T> {
+    const finalResolution = resolutions[resolutions.length - 1];
+    if (this.hasError(finalResolution)) {
+      return this.collectProviderErrors(resolutions);
+    }
+    return this.resolutionToFinalResult(finalResolution);
+  }
+}
diff --git a/packages/server/src/provider/multi-provider/strategies/first-successful-strategy.ts b/packages/server/src/provider/multi-provider/strategies/first-successful-strategy.ts
new file mode 100644
index 000000000..779eb69d3
--- /dev/null
+++ b/packages/server/src/provider/multi-provider/strategies/first-successful-strategy.ts
@@ -0,0 +1,31 @@
+import type { FinalResult, ProviderResolutionResult, StrategyPerProviderContext } from './base-evaluation-strategy';
+import { BaseEvaluationStrategy } from './base-evaluation-strategy';
+import type { EvaluationContext, FlagValue } from '@openfeature/core';
+
+/**
+ * Return the first result that did NOT result in an error
+ * If any provider in the course of evaluation returns or throws an error, ignore it as long as there is a successful result
+ * If there is no successful result, throw all errors
+ */
+export class FirstSuccessfulStrategy extends BaseEvaluationStrategy {
+  override shouldEvaluateNextProvider<T extends FlagValue>(
+    strategyContext: StrategyPerProviderContext,
+    context: EvaluationContext,
+    result: ProviderResolutionResult<T>,
+  ): boolean {
+    // evaluate next only if there was an error
+    return this.hasError(result);
+  }
+
+  override determineFinalResult<T extends FlagValue>(
+    strategyContext: StrategyPerProviderContext,
+    context: EvaluationContext,
+    resolutions: ProviderResolutionResult<T>[],
+  ): FinalResult<T> {
+    const finalResolution = resolutions[resolutions.length - 1];
+    if (this.hasError(finalResolution)) {
+      return this.collectProviderErrors(resolutions);
+    }
+    return this.resolutionToFinalResult(finalResolution);
+  }
+}
diff --git a/packages/server/src/provider/multi-provider/strategies/index.ts b/packages/server/src/provider/multi-provider/strategies/index.ts
new file mode 100644
index 000000000..c611ac485
--- /dev/null
+++ b/packages/server/src/provider/multi-provider/strategies/index.ts
@@ -0,0 +1,4 @@
+export * from './base-evaluation-strategy';
+export * from './first-match-strategy';
+export * from './first-successful-strategy';
+export * from './comparison-strategy';
diff --git a/packages/server/src/provider/multi-provider/types.ts b/packages/server/src/provider/multi-provider/types.ts
new file mode 100644
index 000000000..1e2747bb3
--- /dev/null
+++ b/packages/server/src/provider/multi-provider/types.ts
@@ -0,0 +1,10 @@
+// Represents an entry in the constructor's provider array which may or may not have a name set
+import type { Provider } from '../provider';
+
+export type ProviderEntryInput = {
+  provider: Provider;
+  name?: string;
+};
+
+// Represents a processed and "registered" provider entry where a name has been chosen
+export type RegisteredProvider = Required<ProviderEntryInput>;
diff --git a/packages/server/test/multi-provider.spec.ts b/packages/server/test/multi-provider.spec.ts
new file mode 100644
index 000000000..b63d8203b
--- /dev/null
+++ b/packages/server/test/multi-provider.spec.ts
@@ -0,0 +1,937 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
+import { MultiProvider } from '../src/provider/multi-provider/multi-provider';
+import type {
+  EvaluationContext,
+  FlagValue,
+  FlagValueType,
+  Hook,
+  Logger,
+  Provider,
+  ProviderMetadata,
+  TrackingEventDetails,
+} from '@openfeature/server-sdk';
+import {
+  DefaultLogger,
+  MapHookData,
+  ErrorCode,
+  FlagNotFoundError,
+  InMemoryProvider,
+  OpenFeatureEventEmitter,
+  ServerProviderEvents,
+} from '@openfeature/server-sdk';
+import { FirstMatchStrategy } from '../src/provider/multi-provider/strategies';
+import { FirstSuccessfulStrategy } from '../src/provider/multi-provider/strategies';
+import { ComparisonStrategy } from '../src/provider/multi-provider/strategies';
+
+class TestProvider implements Provider {
+  public metadata: ProviderMetadata = {
+    name: 'TestProvider',
+  };
+  public events = new OpenFeatureEventEmitter();
+  public hooks: Hook[] = [];
+  public track = jest.fn();
+
+  constructor(
+    public resolveBooleanEvaluation = jest.fn().mockResolvedValue({ value: false }),
+    public resolveStringEvaluation = jest.fn().mockResolvedValue({ value: 'default' }),
+    public resolveObjectEvaluation = jest.fn().mockResolvedValue({ value: {} }),
+    public resolveNumberEvaluation = jest.fn().mockResolvedValue({ value: 0 }),
+    public initialize = jest.fn(),
+  ) {}
+
+  emitEvent(type: ServerProviderEvents) {
+    this.events.emit(type, { providerName: this.metadata.name });
+  }
+}
+
+const callEvaluation = async (multi: MultiProvider, context: EvaluationContext, logger: Logger) => {
+  await callBeforeHook(multi, context, 'flag', 'boolean', false, logger);
+  return multi.resolveBooleanEvaluation('flag', false, context);
+};
+
+const callBeforeHook = async (
+  multi: MultiProvider,
+  context: EvaluationContext,
+  flagKey: string,
+  flagType: FlagValueType,
+  defaultValue: FlagValue,
+  logger: Logger = new DefaultLogger(),
+) => {
+  const hookContext = {
+    context: context,
+    flagKey,
+    flagValueType: flagType,
+    defaultValue,
+    clientMetadata: {} as any,
+    providerMetadata: {} as any,
+    logger: logger,
+    hookData: new MapHookData(),
+  };
+  await multi.hooks[0].before?.(hookContext);
+};
+
+describe('MultiProvider', () => {
+  const logger = new DefaultLogger();
+
+  describe('unique names', () => {
+    it('uses provider names for unique types', () => {
+      const multiProvider = new MultiProvider([
+        {
+          provider: new InMemoryProvider(),
+        },
+        {
+          provider: new TestProvider(),
+        },
+      ]);
+      expect(multiProvider.providerEntries[0].name).toEqual('in-memory');
+      expect(multiProvider.providerEntries[1].name).toEqual('TestProvider');
+      expect(multiProvider.providerEntries.length).toBe(2);
+    });
+    it('generates unique names for identical provider types', () => {
+      const multiProvider = new MultiProvider([
+        {
+          provider: new TestProvider(),
+        },
+        {
+          provider: new TestProvider(),
+        },
+        {
+          provider: new TestProvider(),
+        },
+        {
+          provider: new InMemoryProvider(),
+        },
+      ]);
+      expect(multiProvider.providerEntries[0].name).toEqual('TestProvider-1');
+      expect(multiProvider.providerEntries[1].name).toEqual('TestProvider-2');
+      expect(multiProvider.providerEntries[2].name).toEqual('TestProvider-3');
+      expect(multiProvider.providerEntries[3].name).toEqual('in-memory');
+      expect(multiProvider.providerEntries.length).toBe(4);
+    });
+    it('uses specified names for identical provider types', () => {
+      const multiProvider = new MultiProvider([
+        {
+          provider: new TestProvider(),
+          name: 'provider1',
+        },
+        {
+          provider: new TestProvider(),
+          name: 'provider2',
+        },
+      ]);
+      expect(multiProvider.providerEntries[0].name).toEqual('provider1');
+      expect(multiProvider.providerEntries[1].name).toEqual('provider2');
+      expect(multiProvider.providerEntries.length).toBe(2);
+    });
+    it('throws an error if specified names are not unique', () => {
+      expect(
+        () =>
+          new MultiProvider([
+            {
+              provider: new TestProvider(),
+              name: 'provider',
+            },
+            {
+              provider: new InMemoryProvider(),
+              name: 'provider',
+            },
+          ]),
+      ).toThrow();
+    });
+  });
+
+  describe('event tracking and statuses', () => {
+    it('initializes by waiting for all initializations', async () => {
+      const provider1 = new TestProvider();
+      const provider2 = new TestProvider();
+      let initializations = 0;
+      const multiProvider = new MultiProvider([
+        {
+          provider: provider1,
+        },
+        {
+          provider: provider2,
+        },
+      ]);
+      provider1.initialize.mockImplementation(async () => {
+        await new Promise((resolve) => setTimeout(resolve, 1));
+        initializations++;
+      });
+      provider2.initialize.mockImplementation(() => initializations++);
+      await multiProvider.initialize();
+      expect(initializations).toBe(2);
+    });
+
+    it('throws error if a provider errors on initialization', async () => {
+      const provider1 = new TestProvider();
+      const provider2 = new TestProvider();
+      let initializations = 0;
+      const multiProvider = new MultiProvider([
+        {
+          provider: provider1,
+        },
+        {
+          provider: provider2,
+        },
+      ]);
+      provider1.initialize.mockImplementation(async () => {
+        await new Promise((resolve) => setTimeout(resolve, 1));
+        throw new Error('Failure!');
+      });
+      provider2.initialize.mockImplementation(() => initializations++);
+      await expect(() => multiProvider.initialize()).rejects.toThrow('Failure!');
+    });
+
+    it('emits events when aggregate status changes', async () => {
+      const provider1 = new TestProvider();
+      const provider2 = new TestProvider();
+      const multiProvider = new MultiProvider([
+        {
+          provider: provider1,
+        },
+        {
+          provider: provider2,
+        },
+      ]);
+
+      let readyEmitted = 0;
+      let errorEmitted = 0;
+      let staleEmitted = 0;
+      multiProvider.events.addHandler(ServerProviderEvents.Ready, () => {
+        readyEmitted++;
+      });
+
+      multiProvider.events.addHandler(ServerProviderEvents.Error, () => {
+        errorEmitted++;
+      });
+
+      multiProvider.events.addHandler(ServerProviderEvents.Stale, () => {
+        staleEmitted++;
+      });
+
+      await multiProvider.initialize();
+
+      provider1.initialize.mockResolvedValue(true);
+      provider2.initialize.mockResolvedValue(true);
+      provider1.emitEvent(ServerProviderEvents.Error);
+      expect(errorEmitted).toBe(1);
+      provider2.emitEvent(ServerProviderEvents.Error);
+      // don't emit error again unless aggregate status is changing
+      expect(errorEmitted).toBe(1);
+      provider1.emitEvent(ServerProviderEvents.Error);
+      // don't emit error again unless aggregate status is changing
+      expect(errorEmitted).toBe(1);
+      provider2.emitEvent(ServerProviderEvents.Stale);
+      provider1.emitEvent(ServerProviderEvents.Ready);
+      // error status provider is ready now but other provider is stale
+      expect(readyEmitted).toBe(0);
+      expect(staleEmitted).toBe(1);
+      provider2.emitEvent(ServerProviderEvents.Ready);
+      // now both providers are ready
+      expect(readyEmitted).toBe(1);
+    });
+  });
+
+  describe('metadata', () => {
+    it('contains metadata for all providers', () => {
+      const provider1 = new TestProvider();
+      const provider2 = new TestProvider();
+
+      const multiProvider = new MultiProvider([
+        {
+          provider: provider1,
+        },
+        {
+          provider: provider2,
+        },
+      ]);
+      expect(multiProvider.metadata).toEqual({
+        name: 'MultiProvider',
+        'TestProvider-1': provider1.metadata,
+        'TestProvider-2': provider2.metadata,
+      });
+    });
+  });
+
+  describe('evaluation', () => {
+    describe('hooks', () => {
+      it('runs before hooks to modify context for a specific provider and evaluates using that modified context', async () => {
+        const provider1 = new TestProvider();
+        const provider2 = new TestProvider();
+        let hook1Called = false;
+        let hook2Called = false;
+        let after1Called = false;
+        let after2Called = false;
+        const context = {
+          test: true,
+        };
+        const hookContext = {
+          context: context,
+          flagKey: 'flag',
+          flagValueType: 'boolean' as any,
+          defaultValue: false,
+          clientMetadata: {} as any,
+          providerMetadata: {} as any,
+          logger: logger,
+          hookData: new MapHookData(),
+        };
+
+        const weakMap = new WeakMap();
+
+        provider1.hooks = [
+          {
+            before: async (context) => {
+              hook1Called = true;
+              expect(context).toEqual(hookContext);
+              weakMap.set(context, 'test');
+              return { ...context.context, hook1: true };
+            },
+            after: async (context) => {
+              expect(context.context).toEqual({
+                test: true,
+                hook1: true,
+                hook2: true,
+              });
+              expect(weakMap.get(context)).toEqual('test');
+              after1Called = true;
+            },
+          },
+          {
+            before: async (context) => {
+              hook2Called = true;
+              expect(weakMap.get(context)).toEqual('test');
+              expect(context.context).toEqual({
+                test: true,
+                hook1: true,
+              });
+              return { ...context.context, hook2: true };
+            },
+          },
+        ];
+
+        provider2.hooks = [
+          {
+            after: async (context) => {
+              expect(weakMap.get(context)).toBeFalsy();
+              expect(context.context).toEqual({
+                test: true,
+              });
+              after2Called = true;
+            },
+          },
+        ];
+
+        const multiProvider = new MultiProvider(
+          [
+            {
+              provider: provider1,
+            },
+            {
+              provider: provider2,
+            },
+          ],
+          new ComparisonStrategy(provider1),
+        );
+
+        await multiProvider.hooks[0].before!(hookContext);
+        await multiProvider.resolveBooleanEvaluation('flag', false, context);
+        expect(hook1Called).toBe(true);
+        expect(hook2Called).toBe(true);
+        expect(provider1.resolveBooleanEvaluation).toHaveBeenCalledWith(
+          'flag',
+          false,
+          {
+            test: true,
+            hook1: true,
+            hook2: true,
+          },
+          expect.any(Object),
+        );
+        expect(provider2.resolveBooleanEvaluation).toHaveBeenCalledWith(
+          'flag',
+          false,
+          { test: true },
+          expect.any(Object),
+        );
+        expect(after1Called).toBe(true);
+        expect(after2Called).toBe(true);
+      });
+
+      it('runs error hook and finally hook with modified context using same object reference', async () => {
+        const provider1 = new TestProvider();
+        let hook1Called = false;
+        let error1Called = false;
+        let finally1Called = false;
+
+        const context = {
+          test: true,
+        };
+
+        const hookContext = {
+          context: context,
+          flagKey: 'flag',
+          flagValueType: 'boolean' as any,
+          defaultValue: false,
+          clientMetadata: {} as any,
+          providerMetadata: {} as any,
+          logger: logger,
+          hookData: new MapHookData(),
+        };
+
+        const weakMap = new WeakMap();
+
+        provider1.hooks = [
+          {
+            before: async (context) => {
+              hook1Called = true;
+              weakMap.set(context, 'exists');
+              expect(context).toEqual(hookContext);
+              return { ...context.context, hook1: true };
+            },
+            error: async (context) => {
+              expect(context.context).toEqual({
+                test: true,
+                hook1: true,
+              });
+              expect(weakMap.get(context)).toEqual('exists');
+              error1Called = true;
+              throw new Error('error hook error');
+            },
+            finally: async (context) => {
+              expect(context.context).toEqual({
+                test: true,
+                hook1: true,
+              });
+              expect(weakMap.get(context)).toEqual('exists');
+              finally1Called = true;
+            },
+          },
+        ];
+
+        const multiProvider = new MultiProvider([
+          {
+            provider: provider1,
+          },
+        ]);
+
+        provider1.resolveBooleanEvaluation.mockRejectedValue(new Error('test error'));
+
+        // call the multiprovider before hook to set up the hookcontext
+        await multiProvider.hooks[0].before!(hookContext);
+        await expect(() => multiProvider.resolveBooleanEvaluation('flag', false, context)).rejects.toThrow();
+        expect(hook1Called).toBe(true);
+        expect(provider1.resolveBooleanEvaluation).toHaveBeenCalledWith(
+          'flag',
+          false,
+          {
+            test: true,
+            hook1: true,
+          },
+          expect.any(Object),
+        );
+        expect(error1Called).toBe(true);
+        expect(finally1Called).toBe(true);
+      });
+    });
+
+    describe('resolution logic and strategies', () => {
+      describe('evaluation data types', () => {
+        it('evaluates a string variable', async () => {
+          const provider1 = new TestProvider();
+          provider1.resolveStringEvaluation.mockResolvedValue({ value: 'value' });
+
+          const multiProvider = new MultiProvider([
+            {
+              provider: provider1,
+            },
+          ]);
+          const context = {};
+          await callBeforeHook(multiProvider, context, 'flag', 'string', 'default');
+          expect(await multiProvider.resolveStringEvaluation('flag', 'default', context)).toEqual({
+            value: 'value',
+            flagKey: 'flag',
+            flagMetadata: {},
+          });
+        });
+
+        it('evaluates a number variable', async () => {
+          const provider1 = new TestProvider();
+          provider1.resolveNumberEvaluation.mockResolvedValue({ value: 1 });
+
+          const multiProvider = new MultiProvider([
+            {
+              provider: provider1,
+            },
+          ]);
+          const context = {};
+
+          await callBeforeHook(multiProvider, context, 'flag', 'number', 0);
+
+          expect(await multiProvider.resolveNumberEvaluation('flag', 0, context)).toEqual({
+            value: 1,
+            flagKey: 'flag',
+            flagMetadata: {},
+          });
+        });
+
+        it('evaluates a boolean variable', async () => {
+          const provider1 = new TestProvider();
+          provider1.resolveBooleanEvaluation.mockResolvedValue({ value: true });
+
+          const multiProvider = new MultiProvider([
+            {
+              provider: provider1,
+            },
+          ]);
+          const context = {};
+          await callBeforeHook(multiProvider, context, 'flag', 'boolean', false);
+          expect(await multiProvider.resolveBooleanEvaluation('flag', false, context)).toEqual({
+            value: true,
+            flagKey: 'flag',
+            flagMetadata: {},
+          });
+        });
+
+        it('evaluates an object variable', async () => {
+          const provider1 = new TestProvider();
+          provider1.resolveObjectEvaluation.mockResolvedValue({ value: { test: true } });
+
+          const multiProvider = new MultiProvider([
+            {
+              provider: provider1,
+            },
+          ]);
+          const context = {};
+          await callBeforeHook(multiProvider, context, 'flag', 'object', {});
+          expect(await multiProvider.resolveObjectEvaluation('flag', {}, context)).toEqual({
+            flagKey: 'flag',
+            flagMetadata: {},
+            value: { test: true },
+          });
+        });
+      });
+      describe('first match strategy', () => {
+        it('throws an error if any provider throws an error during evaluation', async () => {
+          const provider1 = new TestProvider();
+          const provider2 = new TestProvider();
+          provider1.resolveBooleanEvaluation.mockRejectedValue(new Error('test error'));
+          const multiProvider = new MultiProvider(
+            [
+              {
+                provider: provider1,
+              },
+              {
+                provider: provider2,
+              },
+            ],
+            new FirstMatchStrategy(),
+          );
+
+          await expect(() => callEvaluation(multiProvider, {}, logger)).rejects.toThrow('test error');
+          expect(provider2.resolveBooleanEvaluation).not.toHaveBeenCalled();
+        });
+
+        it('throws an error if any provider returns an error result during evaluation', async () => {
+          const provider1 = new TestProvider();
+          const provider2 = new TestProvider();
+          provider1.resolveBooleanEvaluation.mockResolvedValue({
+            errorCode: 'test-error',
+            errorMessage: 'test error',
+          });
+          const multiProvider = new MultiProvider(
+            [
+              {
+                provider: provider1,
+              },
+              {
+                provider: provider2,
+              },
+            ],
+            new FirstMatchStrategy(),
+          );
+
+          await expect(() => callEvaluation(multiProvider, {}, logger)).rejects.toThrow('test error');
+          expect(provider2.resolveBooleanEvaluation).not.toHaveBeenCalled();
+        });
+
+        it('skips providers that return flag not found until it gets a result, skipping any provider after', async () => {
+          const provider1 = new TestProvider();
+          const provider2 = new TestProvider();
+          const provider3 = new TestProvider();
+          provider1.resolveBooleanEvaluation.mockResolvedValue({
+            errorCode: ErrorCode.FLAG_NOT_FOUND,
+            errorMessage: 'flag not found',
+          });
+          provider2.resolveBooleanEvaluation.mockResolvedValue({
+            value: true,
+          });
+          const multiProvider = new MultiProvider(
+            [
+              {
+                provider: provider1,
+              },
+              {
+                provider: provider2,
+              },
+              {
+                provider: provider3,
+              },
+            ],
+            new FirstMatchStrategy(),
+          );
+          const result = await callEvaluation(multiProvider, {}, logger);
+          expect(result).toEqual({ value: true, flagKey: 'flag', flagMetadata: {} });
+          expect(provider2.resolveBooleanEvaluation).toHaveBeenCalled();
+          expect(provider3.resolveBooleanEvaluation).not.toHaveBeenCalled();
+        });
+
+        it('skips providers that throw flag not found until it gets a result, skipping any provider after', async () => {
+          const provider1 = new TestProvider();
+          const provider2 = new TestProvider();
+          const provider3 = new TestProvider();
+          provider1.resolveBooleanEvaluation.mockRejectedValue(new FlagNotFoundError('flag not found'));
+          provider2.resolveBooleanEvaluation.mockResolvedValue({
+            value: true,
+          });
+          const multiProvider = new MultiProvider(
+            [
+              {
+                provider: provider1,
+              },
+              {
+                provider: provider2,
+              },
+              {
+                provider: provider3,
+              },
+            ],
+            new FirstMatchStrategy(),
+          );
+          const result = await callEvaluation(multiProvider, {}, logger);
+          expect(result).toEqual({ value: true, flagKey: 'flag', flagMetadata: {} });
+          expect(provider2.resolveBooleanEvaluation).toHaveBeenCalled();
+          expect(provider3.resolveBooleanEvaluation).not.toHaveBeenCalled();
+        });
+      });
+
+      describe('first successful strategy', () => {
+        it('ignores errors from earlier providers and returns successful result from later provider', async () => {
+          const provider1 = new TestProvider();
+          const provider2 = new TestProvider();
+          const provider3 = new TestProvider();
+          provider1.resolveBooleanEvaluation.mockResolvedValue({
+            errorCode: 'some error',
+            errorMessage: 'flag not found',
+          });
+          provider2.resolveBooleanEvaluation.mockResolvedValue({
+            value: true,
+          });
+          const multiProvider = new MultiProvider(
+            [
+              {
+                provider: provider1,
+              },
+              {
+                provider: provider2,
+              },
+              {
+                provider: provider3,
+              },
+            ],
+            new FirstSuccessfulStrategy(),
+          );
+          const result = await callEvaluation(multiProvider, {}, logger);
+          expect(result).toEqual({ value: true, flagKey: 'flag', flagMetadata: {} });
+          expect(provider2.resolveBooleanEvaluation).toHaveBeenCalled();
+          expect(provider3.resolveBooleanEvaluation).not.toHaveBeenCalled();
+        });
+      });
+
+      describe('comparison strategy', () => {
+        it('calls every provider in parallel and returns a result if they all agree', async () => {
+          const provider1 = new TestProvider();
+          const provider2 = new TestProvider();
+          const provider3 = new TestProvider();
+          provider1.resolveBooleanEvaluation.mockReturnValue(
+            new Promise((resolve) => {
+              setTimeout(() => resolve({ value: true }), 2);
+            }),
+          );
+
+          provider2.resolveBooleanEvaluation.mockResolvedValue({
+            value: true,
+          });
+          provider3.resolveBooleanEvaluation.mockResolvedValue({
+            value: true,
+          });
+
+          const multiProvider = new MultiProvider(
+            [
+              {
+                provider: provider1,
+              },
+              {
+                provider: provider2,
+              },
+              {
+                provider: provider3,
+              },
+            ],
+            new ComparisonStrategy(provider1),
+          );
+          const resultPromise = callEvaluation(multiProvider, {}, logger);
+          await new Promise((resolve) => process.nextTick(resolve));
+          expect(provider1.resolveBooleanEvaluation).toHaveBeenCalled();
+          expect(provider2.resolveBooleanEvaluation).toHaveBeenCalled();
+          expect(provider3.resolveBooleanEvaluation).toHaveBeenCalled();
+
+          expect(await resultPromise).toEqual({ value: true, flagKey: 'flag', flagMetadata: {} });
+        });
+
+        it('calls every provider and returns the fallback value if any disagree, and calls onMismatch', async () => {
+          const provider1 = new TestProvider();
+          const provider2 = new TestProvider();
+          const provider3 = new TestProvider();
+          provider1.resolveBooleanEvaluation.mockResolvedValue({
+            value: true,
+          });
+          provider2.resolveBooleanEvaluation.mockResolvedValue({
+            value: false,
+          });
+          provider3.resolveBooleanEvaluation.mockResolvedValue({
+            value: false,
+          });
+
+          const onMismatch = jest.fn();
+
+          const multiProvider = new MultiProvider(
+            [
+              {
+                provider: provider1,
+              },
+              {
+                provider: provider2,
+              },
+              {
+                provider: provider3,
+              },
+            ],
+            new ComparisonStrategy(provider1, onMismatch),
+          );
+          const result = await callEvaluation(multiProvider, {}, logger);
+          expect(provider1.resolveBooleanEvaluation).toHaveBeenCalled();
+          expect(provider2.resolveBooleanEvaluation).toHaveBeenCalled();
+          expect(provider3.resolveBooleanEvaluation).toHaveBeenCalled();
+          expect(onMismatch).toHaveBeenCalledWith([
+            {
+              provider: provider1,
+              providerName: 'TestProvider-1',
+              details: { value: true, flagKey: 'flag', flagMetadata: {} },
+            },
+            {
+              provider: provider2,
+              providerName: 'TestProvider-2',
+              details: { value: false, flagKey: 'flag', flagMetadata: {} },
+            },
+            {
+              provider: provider3,
+              providerName: 'TestProvider-3',
+              details: { value: false, flagKey: 'flag', flagMetadata: {} },
+            },
+          ]);
+
+          expect(result).toEqual({ value: true, flagKey: 'flag', flagMetadata: {} });
+        });
+
+        it('returns an error if any provider returns an error', async () => {
+          const provider1 = new TestProvider();
+          const provider2 = new TestProvider();
+          const provider3 = new TestProvider();
+          provider1.resolveBooleanEvaluation.mockRejectedValue(new Error('test error'));
+          provider2.resolveBooleanEvaluation.mockResolvedValue({
+            value: false,
+          });
+          provider3.resolveBooleanEvaluation.mockResolvedValue({
+            value: false,
+          });
+
+          const multiProvider = new MultiProvider(
+            [
+              {
+                provider: provider1,
+              },
+              {
+                provider: provider2,
+              },
+              {
+                provider: provider3,
+              },
+            ],
+            new ComparisonStrategy(provider1),
+          );
+          await expect(callEvaluation(multiProvider, {}, logger)).rejects.toThrow('test error');
+          expect(provider1.resolveBooleanEvaluation).toHaveBeenCalled();
+          expect(provider2.resolveBooleanEvaluation).toHaveBeenCalled();
+          expect(provider3.resolveBooleanEvaluation).toHaveBeenCalled();
+        });
+      });
+    });
+  });
+
+  describe('tracking', () => {
+    const context: EvaluationContext = { targetingKey: 'user123' };
+    const trackingEventDetails: TrackingEventDetails = { value: 100, currency: 'USD' };
+
+    it('calls track on all providers by default', () => {
+      const provider1 = new TestProvider();
+      const provider2 = new TestProvider();
+      const provider3 = new TestProvider();
+
+      const multiProvider = new MultiProvider([
+        { provider: provider1 },
+        { provider: provider2 },
+        { provider: provider3 },
+      ]);
+
+      multiProvider.track('purchase', context, trackingEventDetails);
+
+      expect(provider1.track).toHaveBeenCalledWith('purchase', context, trackingEventDetails);
+      expect(provider2.track).toHaveBeenCalledWith('purchase', context, trackingEventDetails);
+      expect(provider3.track).toHaveBeenCalledWith('purchase', context, trackingEventDetails);
+    });
+
+    it('skips providers without track method', () => {
+      const provider1 = new TestProvider();
+      const provider2 = new InMemoryProvider(); // Doesn't have track method
+      const provider3 = new TestProvider();
+
+      const multiProvider = new MultiProvider([
+        { provider: provider1 },
+        { provider: provider2 },
+        { provider: provider3 },
+      ]);
+
+      expect(() => multiProvider.track('purchase', context, trackingEventDetails)).not.toThrow();
+      expect(provider1.track).toHaveBeenCalledWith('purchase', context, trackingEventDetails);
+      expect(provider3.track).toHaveBeenCalledWith('purchase', context, trackingEventDetails);
+    });
+
+    it('continues tracking with other providers when one throws an error', () => {
+      const provider1 = new TestProvider();
+      const provider2 = new TestProvider();
+      const provider3 = new TestProvider();
+
+      provider2.track.mockImplementation(() => {
+        throw new Error('Tracking failed');
+      });
+
+      const mockLogger = { error: jest.fn(), warn: jest.fn(), info: jest.fn(), debug: jest.fn() };
+      const multiProvider = new MultiProvider(
+        [{ provider: provider1 }, { provider: provider2 }, { provider: provider3 }],
+        undefined,
+        mockLogger,
+      );
+
+      expect(() => multiProvider.track('purchase', context, trackingEventDetails)).not.toThrow();
+
+      expect(provider1.track).toHaveBeenCalledWith('purchase', context, trackingEventDetails);
+      expect(provider2.track).toHaveBeenCalledWith('purchase', context, trackingEventDetails);
+      expect(provider3.track).toHaveBeenCalledWith('purchase', context, trackingEventDetails);
+      expect(mockLogger.error).toHaveBeenCalledWith(
+        'Error tracking event "purchase" with provider "TestProvider-2":',
+        expect.any(Error),
+      );
+    });
+
+    it('respects strategy shouldTrackWithThisProvider decision', () => {
+      const provider1 = new TestProvider();
+      const provider2 = new TestProvider();
+      const provider3 = new TestProvider();
+
+      const mockStrategy = new FirstMatchStrategy();
+      mockStrategy.shouldTrackWithThisProvider = jest
+        .fn()
+        .mockReturnValueOnce(true) // provider1: should track
+        .mockReturnValueOnce(false) // provider2: should not track
+        .mockReturnValueOnce(true); // provider3: should track
+
+      const multiProvider = new MultiProvider(
+        [{ provider: provider1 }, { provider: provider2 }, { provider: provider3 }],
+        mockStrategy,
+      );
+
+      multiProvider.track('purchase', context, trackingEventDetails);
+
+      expect(provider1.track).toHaveBeenCalledWith('purchase', context, trackingEventDetails);
+      expect(provider2.track).not.toHaveBeenCalled();
+      expect(provider3.track).toHaveBeenCalledWith('purchase', context, trackingEventDetails);
+
+      expect(mockStrategy.shouldTrackWithThisProvider).toHaveBeenCalledTimes(3);
+      expect(mockStrategy.shouldTrackWithThisProvider).toHaveBeenCalledWith(
+        expect.objectContaining({
+          provider: provider1,
+          providerName: 'TestProvider-1',
+        }),
+        context,
+        'purchase',
+        trackingEventDetails,
+      );
+    });
+
+    it('does not track with providers in NOT_READY or FATAL status by default', () => {
+      const provider1 = new TestProvider();
+      const provider2 = new TestProvider();
+      const provider3 = new TestProvider();
+
+      const multiProvider = new MultiProvider([
+        { provider: provider1 },
+        { provider: provider2 },
+        { provider: provider3 },
+      ]);
+
+      // Simulate providers with different statuses
+      const mockStatusTracker = {
+        providerStatus: jest
+          .fn()
+          .mockReturnValueOnce('READY') // provider1: ready
+          .mockReturnValueOnce('NOT_READY') // provider2: not ready
+          .mockReturnValueOnce('FATAL'), // provider3: fatal
+      };
+      (multiProvider as any).statusTracker = mockStatusTracker;
+
+      multiProvider.track('purchase', context, trackingEventDetails);
+
+      expect(provider1.track).toHaveBeenCalledWith('purchase', context, trackingEventDetails);
+      expect(provider2.track).not.toHaveBeenCalled();
+      expect(provider3.track).not.toHaveBeenCalled();
+    });
+
+    it('passes correct strategy context to shouldTrackWithThisProvider', () => {
+      const provider1 = new TestProvider();
+
+      const mockStrategy = new FirstMatchStrategy();
+      mockStrategy.shouldTrackWithThisProvider = jest.fn().mockReturnValue(true);
+
+      const multiProvider = new MultiProvider([{ provider: provider1, name: 'custom-name' }], mockStrategy);
+
+      // Mock the status tracker to return a proper status
+      const mockStatusTracker = {
+        providerStatus: jest.fn().mockReturnValue('READY'),
+      };
+      (multiProvider as any).statusTracker = mockStatusTracker;
+
+      multiProvider.track('purchase', context, trackingEventDetails);
+
+      expect(mockStrategy.shouldTrackWithThisProvider).toHaveBeenCalledWith(
+        expect.objectContaining({
+          provider: provider1,
+          providerName: 'custom-name',
+          providerStatus: 'READY',
+        }),
+        context,
+        'purchase',
+        trackingEventDetails,
+      );
+    });
+  });
+});
diff --git a/packages/web/README.md b/packages/web/README.md
index 517ee6699..613c11db0 100644
--- a/packages/web/README.md
+++ b/packages/web/README.md
@@ -145,6 +145,63 @@ Once the provider has been registered, the status can be tracked using [events](
 In some situations, it may be beneficial to register multiple providers in the same application.
 This is possible using [domains](#domains), which is covered in more detail below.
 
+#### Multi-Provider
+
+The Multi-Provider allows you to use multiple underlying providers as sources of flag data for the OpenFeature web SDK. When a flag is being evaluated, the Multi-Provider will consult each underlying provider it is managing in order to determine the final result. Different evaluation strategies can be defined to control which providers get evaluated and which result is used.
+
+The Multi-Provider is a powerful tool for performing migrations between flag providers, or combining multiple providers into a single feature flagging interface. For example:
+
+- **Migration**: When migrating between two providers, you can run both in parallel under a unified flagging interface. As flags are added to the new provider, the Multi-Provider will automatically find and return them, falling back to the old provider if the new provider does not have the flag.
+- **Multiple Data Sources**: The Multi-Provider allows you to seamlessly combine many sources of flagging data, such as environment variables, local files, database values and SaaS hosted feature management systems.
+
+```ts
+import { WebMultiProvider } from '@openfeature/web-sdk';
+
+const multiProvider = new WebMultiProvider([
+  { provider: new ProviderA() },
+  { provider: new ProviderB() }
+]);
+
+await OpenFeature.setProviderAndWait(multiProvider);
+
+const client = OpenFeature.getClient();
+console.log(client.getBooleanDetails("my-flag", false));
+```
+
+By default, the Multi-Provider will evaluate all underlying providers in order and return the first successful result. If a provider indicates it does not have a flag (FLAG_NOT_FOUND error code), then it will be skipped and the next provider will be evaluated.
+
+##### Evaluation Strategies
+
+The Multi-Provider comes with three strategies out of the box:
+
+- **FirstMatchStrategy** (default): Evaluates all providers in order and returns the first successful result. Providers that indicate FLAG_NOT_FOUND error will be skipped and the next provider will be evaluated.
+- **FirstSuccessfulStrategy**: Evaluates all providers in order and returns the first successful result. Any error will cause that provider to be skipped.
+- **ComparisonStrategy**: Evaluates all providers sequentially. If every provider returns a successful result with the same value, then that result is returned. Otherwise, the result returned by the configured "fallback provider" will be used.
+
+```ts
+import { WebMultiProvider, FirstSuccessfulStrategy } from '@openfeature/web-sdk';
+
+const multiProvider = new WebMultiProvider(
+  [
+    { provider: new ProviderA() },
+    { provider: new ProviderB() }
+  ], 
+  new FirstSuccessfulStrategy()
+);
+```
+
+##### Tracking Support
+
+The Multi-Provider supports tracking events across multiple providers, allowing you to send analytics events to all configured providers simultaneously:
+
+```ts
+// Tracked events will be sent to all providers by default
+client.track('user-conversion', { 
+  value: 99.99, 
+  currency: 'USD' 
+});
+```
+
 ### Flag evaluation flow
 
 When a new provider is added to OpenFeature client the following process happens:
diff --git a/packages/web/src/provider/index.ts b/packages/web/src/provider/index.ts
index 33e12fea3..ca2771629 100644
--- a/packages/web/src/provider/index.ts
+++ b/packages/web/src/provider/index.ts
@@ -1,3 +1,4 @@
 export * from './provider';
 export * from './no-op-provider';
 export * from './in-memory-provider';
+export * from './multi-provider';
diff --git a/packages/web/src/provider/multi-provider/README.md b/packages/web/src/provider/multi-provider/README.md
new file mode 100644
index 000000000..fdbb56914
--- /dev/null
+++ b/packages/web/src/provider/multi-provider/README.md
@@ -0,0 +1,199 @@
+# OpenFeature Multi-Provider
+
+The Multi-Provider allows you to use multiple underlying providers as sources of flag data for the OpenFeature web SDK.
+When a flag is being evaluated, the Multi-Provider will consult each underlying provider it is managing in order to determine
+the final result. Different evaluation strategies can be defined to control which providers get evaluated and which result is used.
+
+The Multi-Provider is a powerful tool for performing migrations between flag providers, or combining multiple providers into a single
+feature flagging interface. For example:
+
+- *Migration*: When migrating between two providers, you can run both in parallel under a unified flagging interface. As flags are added to the
+new provider, the Multi-Provider will automatically find and return them, falling back to the old provider if the new provider does not have
+- *Multiple Data Sources*: The Multi-Provider allows you to seamlessly combine many sources of flagging data, such as environment variables, 
+local files, database values and SaaS hosted feature management systems.
+
+## Usage
+
+The Multi-Provider is initialized with an array of providers it should evaluate:
+
+```typescript
+import { WebMultiProvider } from '@openfeature/web-sdk'
+import { OpenFeature } from '@openfeature/web-sdk'
+
+const multiProvider = new WebMultiProvider([
+  { provider: new ProviderA() },
+  { provider: new ProviderB() }
+])
+
+await OpenFeature.setProviderAndWait(multiProvider)
+
+const client = OpenFeature.getClient()
+
+console.log("Evaluating flag")
+console.log(client.getBooleanDetails("my-flag", false));
+```
+
+By default, the Multi-Provider will evaluate all underlying providers in order and return the first successful result. If a provider indicates
+it does not have a flag (FLAG_NOT_FOUND error code), then it will be skipped and the next provider will be evaluated. If any provider throws
+or returns an error result, the operation will fail and the error will be thrown. If no provider returns a successful result, the operation
+will fail with a FLAG_NOT_FOUND error code.
+
+To change this behaviour, a different "strategy" can be provided:
+
+```typescript
+import { WebMultiProvider, FirstSuccessfulStrategy } from '@openfeature/web-sdk'
+
+const multiProvider = new WebMultiProvider(
+    [
+      { provider: new ProviderA() },
+      { provider: new ProviderB() }
+    ], 
+    new FirstSuccessfulStrategy()
+)
+```
+
+## Strategies
+
+The Multi-Provider comes with three strategies out of the box:
+
+- `FirstMatchStrategy` (default): Evaluates all providers in order and returns the first successful result. Providers that indicate FLAG_NOT_FOUND error will be skipped and the next provider will be evaluated. Any other error will cause the operation to fail and the set of errors to be thrown.
+- `FirstSuccessfulStrategy`: Evaluates all providers in order and returns the first successful result. Any error will cause that provider to be skipped.
+If no successful result is returned, the set of errors will be thrown.
+- `ComparisonStrategy`: Evaluates all providers sequentially. If every provider returns a successful result with the same value, then that result is returned.
+Otherwise, the result returned by the configured "fallback provider" will be used. When values do not agree, an optional callback will be executed to notify
+you of the mismatch. This can be useful when migrating between providers that are expected to contain identical configuration. You can easily spot mismatches
+in configuration without affecting flag behaviour.
+
+This strategy accepts several arguments during initialization:
+
+```typescript
+import { WebMultiProvider, ComparisonStrategy } from '@openfeature/web-sdk'
+
+const providerA = new ProviderA()
+const multiProvider = new WebMultiProvider(
+  [
+    { provider: providerA },
+    { provider: new ProviderB() }
+  ],
+  new ComparisonStrategy(providerA, (details) => {
+      console.log("Mismatch detected", details)
+  })
+)
+```
+
+The first argument is the "fallback provider" whose value to use in the event that providers do not agree. It should be the same object reference as one of the providers in the list. The second argument is a callback function that will be executed when a mismatch is detected. The callback will be passed an object containing the details of each provider's resolution, including the flag key, the value returned, and any errors that were thrown.
+
+## Custom Strategies
+
+It is also possible to implement your own strategy if the above options do not fit your use case. To do so, create a class which implements the "BaseEvaluationStrategy":
+
+```typescript
+export abstract class BaseEvaluationStrategy {
+    public runMode: 'parallel' | 'sequential' = 'sequential';
+
+    abstract shouldEvaluateThisProvider(strategyContext: StrategyPerProviderContext, evalContext: EvaluationContext): boolean;
+
+    abstract shouldEvaluateNextProvider<T extends FlagValue>(
+        strategyContext: StrategyPerProviderContext,
+        context: EvaluationContext,
+        result: ProviderResolutionResult<T>,
+    ): boolean;
+
+    abstract shouldTrackWithThisProvider(
+        strategyContext: StrategyProviderContext,
+        context: EvaluationContext,
+        trackingEventName: string,
+        trackingEventDetails: TrackingEventDetails,
+    ): boolean;
+
+    abstract determineFinalResult<T extends FlagValue>(
+        strategyContext: StrategyEvaluationContext,
+        context: EvaluationContext,
+        resolutions: ProviderResolutionResult<T>[],
+    ): FinalResult<T>;
+}
+```
+
+The `runMode` property determines whether the list of providers will be evaluated sequentially or in parallel.
+
+The `shouldEvaluateThisProvider` method is called just before a provider is evaluated by the Multi-Provider. If the function returns `false`, then
+the provider will be skipped instead of being evaluated. The function is called with details about the evaluation including the flag key and type.
+Check the type definitions for the full list.
+
+The `shouldEvaluateNextProvider` function is called after a provider is evaluated. If it returns `true`, the next provider in the sequence will be called,
+otherwise no more providers will be evaluated. It is called with the same data as `shouldEvaluateThisProvider` as well as the details about the evaluation result. This function is not called when the `runMode` is `parallel`.
+
+The `shouldTrackWithThisProvider` method is called before tracking an event with each provider. If the function returns `false`, then
+the provider will be skipped for that tracking event. The method includes the tracking event name and details,
+allowing for fine-grained control over which providers receive which events. By default, providers in `NOT_READY` or `FATAL` status are skipped.
+
+The `determineFinalResult` function is called after all providers have been called, or the `shouldEvaluateNextProvider` function returned false. It is called
+with a list of results from all the individual providers' evaluations. It returns the final decision for evaluation result, or throws an error if needed.
+
+## Tracking Support
+
+The Multi-Provider supports tracking events across multiple providers, allowing you to send analytics events to all configured providers simultaneously.
+
+### Basic Tracking Usage
+
+```typescript
+import { WebMultiProvider } from '@openfeature/web-sdk'
+import { OpenFeature } from '@openfeature/web-sdk'
+
+const multiProvider = new WebMultiProvider([
+  { provider: new ProviderA() },
+  { provider: new ProviderB() }
+])
+
+await OpenFeature.setProviderAndWait(multiProvider)
+const client = OpenFeature.getClient()
+
+// Tracked events will be sent to all providers by default
+client.track('user-conversion', { 
+  value: 99.99, 
+  currency: 'USD',
+  conversionType: 'purchase' 
+})
+
+client.track('page-view', {
+  page: '/checkout',
+  source: 'direct'
+})
+```
+
+### Tracking Behavior
+
+- **Default**: All providers receive tracking calls by default
+- **Error Handling**: If one provider fails to track, others continue normally and errors are logged
+- **Provider Status**: Providers in `NOT_READY` or `FATAL` status are automatically skipped
+- **Optional Method**: Providers without a `track` method are gracefully skipped
+
+### Customizing Tracking with Strategies
+
+You can customize which providers receive tracking calls by overriding the `shouldTrackWithThisProvider` method in your custom strategy:
+
+```typescript
+import { BaseEvaluationStrategy, StrategyProviderContext } from '@openfeature/web-sdk'
+
+class CustomTrackingStrategy extends BaseEvaluationStrategy {
+  // Override tracking behavior
+  shouldTrackWithThisProvider(
+    strategyContext: StrategyProviderContext,
+    context: EvaluationContext,
+    trackingEventName: string,
+    trackingEventDetails: TrackingEventDetails,
+  ): boolean {
+    // Only track with the primary provider
+    if (strategyContext.providerName === 'primary-provider') {
+      return true;
+    }
+    
+    // Skip tracking for analytics events on backup providers
+    if (trackingEventName.startsWith('analytics.')) {
+      return false;
+    }
+    
+    return super.shouldTrackWithThisProvider(strategyContext, context, trackingEventName, trackingEventDetails);
+  }
+}
+```
diff --git a/packages/web/src/provider/multi-provider/errors.ts b/packages/web/src/provider/multi-provider/errors.ts
new file mode 100644
index 000000000..f1f14438d
--- /dev/null
+++ b/packages/web/src/provider/multi-provider/errors.ts
@@ -0,0 +1,53 @@
+import type { ErrorCode } from '@openfeature/core';
+import { GeneralError, OpenFeatureError } from '@openfeature/core';
+import type { RegisteredProvider } from './types';
+
+export class ErrorWithCode extends OpenFeatureError {
+  constructor(
+    public code: ErrorCode,
+    message: string,
+  ) {
+    super(message);
+  }
+}
+
+export class AggregateError extends GeneralError {
+  constructor(
+    message: string,
+    public originalErrors: { source: string; error: unknown }[],
+  ) {
+    super(message);
+  }
+}
+
+export const constructAggregateError = (providerErrors: { error: unknown; providerName: string }[]) => {
+  const errorsWithSource = providerErrors
+    .map(({ providerName, error }) => {
+      return { source: providerName, error };
+    })
+    .flat();
+
+  // log first error in the message for convenience, but include all errors in the error object for completeness
+  return new AggregateError(
+    `Provider errors occurred: ${errorsWithSource[0].source}: ${errorsWithSource[0].error}`,
+    errorsWithSource,
+  );
+};
+
+export const throwAggregateErrorFromPromiseResults = (
+  result: PromiseSettledResult<unknown>[],
+  providerEntries: RegisteredProvider[],
+) => {
+  const errors = result
+    .map((r, i) => {
+      if (r.status === 'rejected') {
+        return { error: r.reason, providerName: providerEntries[i].name };
+      }
+      return null;
+    })
+    .filter((val): val is { error: unknown; providerName: string } => Boolean(val));
+
+  if (errors.length) {
+    throw constructAggregateError(errors);
+  }
+};
diff --git a/packages/web/src/provider/multi-provider/hook-executor.ts b/packages/web/src/provider/multi-provider/hook-executor.ts
new file mode 100644
index 000000000..89749287e
--- /dev/null
+++ b/packages/web/src/provider/multi-provider/hook-executor.ts
@@ -0,0 +1,62 @@
+import type { EvaluationDetails, FlagValue, HookContext, HookHints, Logger } from '@openfeature/core';
+import type { Hook } from '../../hooks';
+
+/**
+ * Utility for executing a set of hooks of each type. Implementation is largely copied from the main OpenFeature SDK.
+ */
+export class HookExecutor {
+  constructor(private logger: Logger) {}
+
+  beforeHooks(hooks: Hook[] | undefined, hookContext: HookContext, hints: HookHints) {
+    for (const hook of hooks ?? []) {
+      hook?.before?.(hookContext, Object.freeze(hints));
+    }
+  }
+
+  afterHooks(
+    hooks: Hook[] | undefined,
+    hookContext: HookContext,
+    evaluationDetails: EvaluationDetails<FlagValue>,
+    hints: HookHints,
+  ) {
+    // run "after" hooks sequentially
+    for (const hook of hooks ?? []) {
+      hook?.after?.(hookContext, evaluationDetails, hints);
+    }
+  }
+
+  errorHooks(hooks: Hook[] | undefined, hookContext: HookContext, err: unknown, hints: HookHints) {
+    // run "error" hooks sequentially
+    for (const hook of hooks ?? []) {
+      try {
+        hook?.error?.(hookContext, err, hints);
+      } catch (err) {
+        this.logger.error(`Unhandled error during 'error' hook: ${err}`);
+        if (err instanceof Error) {
+          this.logger.error(err.stack);
+        }
+        this.logger.error((err as Error)?.stack);
+      }
+    }
+  }
+
+  finallyHooks(
+    hooks: Hook[] | undefined,
+    hookContext: HookContext,
+    evaluationDetails: EvaluationDetails<FlagValue>,
+    hints: HookHints,
+  ) {
+    // run "finally" hooks sequentially
+    for (const hook of hooks ?? []) {
+      try {
+        hook?.finally?.(hookContext, evaluationDetails, hints);
+      } catch (err) {
+        this.logger.error(`Unhandled error during 'finally' hook: ${err}`);
+        if (err instanceof Error) {
+          this.logger.error(err.stack);
+        }
+        this.logger.error((err as Error)?.stack);
+      }
+    }
+  }
+}
diff --git a/packages/web/src/provider/multi-provider/index.ts b/packages/web/src/provider/multi-provider/index.ts
new file mode 100644
index 000000000..8cae17a14
--- /dev/null
+++ b/packages/web/src/provider/multi-provider/index.ts
@@ -0,0 +1,3 @@
+export * from './multi-provider-web';
+export * from './errors';
+export * from './strategies';
diff --git a/packages/web/src/provider/multi-provider/multi-provider-web.ts b/packages/web/src/provider/multi-provider/multi-provider-web.ts
new file mode 100644
index 000000000..8dbcf075d
--- /dev/null
+++ b/packages/web/src/provider/multi-provider/multi-provider-web.ts
@@ -0,0 +1,349 @@
+import type {
+  EvaluationContext,
+  FlagValueType,
+  HookContext,
+  HookHints,
+  JsonValue,
+  Logger,
+  ProviderMetadata,
+  BeforeHookContext,
+  ResolutionDetails,
+  FlagMetadata,
+  EvaluationDetails,
+  FlagValue,
+  OpenFeatureError,
+  TrackingEventDetails,
+} from '@openfeature/core';
+import type { Provider } from '../../provider';
+import type { Hook } from '../../hooks';
+import { OpenFeatureEventEmitter } from '../../events';
+import { DefaultLogger, GeneralError, ErrorCode, StandardResolutionReasons } from '@openfeature/core';
+import { HookExecutor } from './hook-executor';
+import { constructAggregateError, throwAggregateErrorFromPromiseResults } from './errors';
+import type { BaseEvaluationStrategy, ProviderResolutionResult } from './strategies';
+import { FirstMatchStrategy } from './strategies';
+import { StatusTracker } from './status-tracker';
+import type { ProviderEntryInput, RegisteredProvider } from './types';
+
+export class MultiProvider implements Provider {
+  readonly runsOn = 'client';
+
+  public readonly events = new OpenFeatureEventEmitter();
+
+  private hookContexts: WeakMap<EvaluationContext, HookContext> = new WeakMap<EvaluationContext, HookContext>();
+  private hookHints: WeakMap<EvaluationContext, HookHints> = new WeakMap<EvaluationContext, HookHints>();
+
+  metadata: ProviderMetadata;
+
+  providerEntries: RegisteredProvider[] = [];
+  private providerEntriesByName: Record<string, RegisteredProvider> = {};
+
+  private hookExecutor: HookExecutor;
+  private statusTracker = new StatusTracker(this.events);
+
+  constructor(
+    readonly constructorProviders: ProviderEntryInput[],
+    private readonly evaluationStrategy: BaseEvaluationStrategy = new FirstMatchStrategy(),
+    private readonly logger: Logger = new DefaultLogger(),
+  ) {
+    this.hookExecutor = new HookExecutor(this.logger);
+
+    this.registerProviders(constructorProviders);
+
+    const aggregateMetadata = Object.keys(this.providerEntriesByName).reduce((acc, name) => {
+      return { ...acc, [name]: this.providerEntriesByName[name].provider.metadata };
+    }, {});
+
+    this.metadata = {
+      ...aggregateMetadata,
+      name: MultiProvider.name,
+    };
+  }
+
+  private registerProviders(constructorProviders: ProviderEntryInput[]) {
+    const providersByName: Record<string, Provider[]> = {};
+
+    for (const constructorProvider of constructorProviders) {
+      const providerName = constructorProvider.provider.metadata.name;
+      const candidateName = constructorProvider.name ?? providerName;
+
+      if (constructorProvider.name && providersByName[constructorProvider.name]) {
+        throw new Error('Provider names must be unique');
+      }
+
+      providersByName[candidateName] ??= [];
+      providersByName[candidateName].push(constructorProvider.provider);
+    }
+
+    for (const name of Object.keys(providersByName)) {
+      const useIndexedNames = providersByName[name].length > 1;
+      for (let i = 0; i < providersByName[name].length; i++) {
+        const indexedName = useIndexedNames ? `${name}-${i + 1}` : name;
+        this.providerEntriesByName[indexedName] = { provider: providersByName[name][i], name: indexedName };
+        this.providerEntries.push(this.providerEntriesByName[indexedName]);
+        this.statusTracker.wrapEventHandler(this.providerEntriesByName[indexedName]);
+      }
+    }
+
+    // just make sure we don't accidentally modify these later
+    Object.freeze(this.providerEntries);
+    Object.freeze(this.providerEntriesByName);
+  }
+
+  async initialize(context?: EvaluationContext): Promise<void> {
+    const result = await Promise.allSettled(
+      this.providerEntries.map((provider) => provider.provider.initialize?.(context)),
+    );
+    throwAggregateErrorFromPromiseResults(result, this.providerEntries);
+  }
+
+  async onClose() {
+    const result = await Promise.allSettled(this.providerEntries.map((provider) => provider.provider.onClose?.()));
+    throwAggregateErrorFromPromiseResults(result, this.providerEntries);
+  }
+
+  async onContextChange(oldContext: EvaluationContext, newContext: EvaluationContext) {
+    for (const providerEntry of this.providerEntries) {
+      await providerEntry.provider.onContextChange?.(oldContext, newContext);
+    }
+  }
+
+  resolveBooleanEvaluation(
+    flagKey: string,
+    defaultValue: boolean,
+    context: EvaluationContext,
+  ): ResolutionDetails<boolean> {
+    return this.flagResolutionProxy<boolean>(flagKey, 'boolean', defaultValue, context);
+  }
+
+  resolveStringEvaluation(
+    flagKey: string,
+    defaultValue: string,
+    context: EvaluationContext,
+  ): ResolutionDetails<string> {
+    return this.flagResolutionProxy(flagKey, 'string', defaultValue, context);
+  }
+
+  resolveNumberEvaluation(
+    flagKey: string,
+    defaultValue: number,
+    context: EvaluationContext,
+  ): ResolutionDetails<number> {
+    return this.flagResolutionProxy(flagKey, 'number', defaultValue, context);
+  }
+
+  resolveObjectEvaluation<T extends JsonValue>(
+    flagKey: string,
+    defaultValue: T,
+    context: EvaluationContext,
+  ): ResolutionDetails<T> {
+    return this.flagResolutionProxy(flagKey, 'object', defaultValue, context);
+  }
+
+  track(trackingEventName: string, context: EvaluationContext, trackingEventDetails: TrackingEventDetails): void {
+    for (const providerEntry of this.providerEntries) {
+      if (!providerEntry.provider.track) {
+        continue;
+      }
+
+      const strategyContext = {
+        provider: providerEntry.provider,
+        providerName: providerEntry.name,
+        providerStatus: this.statusTracker.providerStatus(providerEntry.name),
+      };
+
+      if (
+        this.evaluationStrategy.shouldTrackWithThisProvider(
+          strategyContext,
+          context,
+          trackingEventName,
+          trackingEventDetails,
+        )
+      ) {
+        try {
+          providerEntry.provider.track?.(trackingEventName, context, trackingEventDetails);
+        } catch (error) {
+          this.logger.error(
+            `Error tracking event "${trackingEventName}" with provider "${providerEntry.name}":`,
+            error,
+          );
+        }
+      }
+    }
+  }
+
+  private flagResolutionProxy<T extends boolean | string | number | JsonValue>(
+    flagKey: string,
+    flagType: FlagValueType,
+    defaultValue: T,
+    context: EvaluationContext,
+  ): ResolutionDetails<T> {
+    const hookContext = this.hookContexts.get(context);
+    const hookHints = this.hookHints.get(context);
+
+    if (!hookContext || !hookHints) {
+      throw new GeneralError('Hook context not available for evaluation');
+    }
+
+    const results = [] as (ProviderResolutionResult<T> | null)[];
+
+    for (const providerEntry of this.providerEntries) {
+      const [shouldEvaluateNext, result] = this.evaluateProviderEntry(
+        flagKey,
+        flagType,
+        defaultValue,
+        providerEntry,
+        hookContext,
+        hookHints,
+        context,
+      );
+
+      results.push(result);
+
+      if (!shouldEvaluateNext) {
+        break;
+      }
+    }
+
+    const resolutions = results.filter((r): r is ProviderResolutionResult<T> => Boolean(r));
+    const finalResult = this.evaluationStrategy.determineFinalResult({ flagKey, flagType }, context, resolutions);
+
+    if (finalResult.errors?.length) {
+      throw constructAggregateError(finalResult.errors);
+    }
+
+    if (!finalResult.details) {
+      throw new GeneralError('No result was returned from any provider');
+    }
+
+    return finalResult.details;
+  }
+
+  private evaluateProviderEntry<T extends boolean | string | number | JsonValue>(
+    flagKey: string,
+    flagType: FlagValueType,
+    defaultValue: T,
+    providerEntry: RegisteredProvider,
+    hookContext: HookContext,
+    hookHints: HookHints,
+    context: EvaluationContext,
+  ): [boolean, ProviderResolutionResult<T> | null] {
+    let evaluationResult: ResolutionDetails<T> | undefined = undefined;
+    const provider = providerEntry.provider;
+    const strategyContext = {
+      flagKey,
+      flagType,
+      provider,
+      providerName: providerEntry.name,
+      providerStatus: this.statusTracker.providerStatus(providerEntry.name),
+    };
+
+    if (!this.evaluationStrategy.shouldEvaluateThisProvider(strategyContext, context)) {
+      return [true, null];
+    }
+
+    let resolution: ProviderResolutionResult<T>;
+
+    try {
+      evaluationResult = this.evaluateProviderAndHooks(flagKey, defaultValue, provider, hookContext, hookHints);
+      resolution = {
+        details: evaluationResult,
+        provider: provider,
+        providerName: providerEntry.name,
+      };
+    } catch (error: unknown) {
+      resolution = {
+        thrownError: error,
+        provider: provider,
+        providerName: providerEntry.name,
+      };
+    }
+
+    return [this.evaluationStrategy.shouldEvaluateNextProvider(strategyContext, context, resolution), resolution];
+  }
+
+  private evaluateProviderAndHooks<T extends boolean | string | number | JsonValue>(
+    flagKey: string,
+    defaultValue: T,
+    provider: Provider,
+    hookContext: HookContext,
+    hookHints: HookHints,
+  ) {
+    let evaluationDetails: EvaluationDetails<T>;
+
+    try {
+      this.hookExecutor.beforeHooks(provider.hooks, hookContext, hookHints);
+
+      const resolutionDetails = this.callProviderResolve<T>(
+        provider,
+        flagKey,
+        defaultValue,
+        hookContext.context,
+      ) as ResolutionDetails<T>;
+
+      evaluationDetails = {
+        ...resolutionDetails,
+        flagMetadata: Object.freeze(resolutionDetails.flagMetadata ?? {}),
+        flagKey,
+      };
+
+      this.hookExecutor.afterHooks(provider.hooks, hookContext, evaluationDetails, hookHints);
+    } catch (error: unknown) {
+      this.hookExecutor.errorHooks(provider.hooks, hookContext, error, hookHints);
+      evaluationDetails = this.getErrorEvaluationDetails(flagKey, defaultValue, error);
+    }
+    this.hookExecutor.finallyHooks(provider.hooks, hookContext, evaluationDetails, hookHints);
+    return evaluationDetails;
+  }
+
+  private callProviderResolve<T extends boolean | string | number | JsonValue>(
+    provider: Provider,
+    flagKey: string,
+    defaultValue: T,
+    context: EvaluationContext,
+  ) {
+    switch (typeof defaultValue) {
+      case 'string':
+        return provider.resolveStringEvaluation(flagKey, defaultValue, context, this.logger);
+      case 'number':
+        return provider.resolveNumberEvaluation(flagKey, defaultValue, context, this.logger);
+      case 'object':
+        return provider.resolveObjectEvaluation(flagKey, defaultValue, context, this.logger);
+      case 'boolean':
+        return provider.resolveBooleanEvaluation(flagKey, defaultValue, context, this.logger);
+      default:
+        throw new GeneralError('Invalid flag evaluation type');
+    }
+  }
+
+  public get hooks(): Hook[] {
+    return [
+      {
+        before: (hookContext: BeforeHookContext, hints: HookHints): EvaluationContext => {
+          this.hookContexts.set(hookContext.context, hookContext);
+          this.hookHints.set(hookContext.context, hints ?? {});
+          return hookContext.context;
+        },
+      },
+    ];
+  }
+
+  private getErrorEvaluationDetails<T extends FlagValue>(
+    flagKey: string,
+    defaultValue: T,
+    err: unknown,
+    flagMetadata: FlagMetadata = {},
+  ): EvaluationDetails<T> {
+    const errorMessage: string = (err as Error)?.message;
+    const errorCode: ErrorCode = (err as OpenFeatureError)?.code || ErrorCode.GENERAL;
+
+    return {
+      errorCode,
+      errorMessage,
+      value: defaultValue,
+      reason: StandardResolutionReasons.ERROR,
+      flagMetadata: Object.freeze(flagMetadata),
+      flagKey,
+    };
+  }
+}
diff --git a/packages/web/src/provider/multi-provider/status-tracker.ts b/packages/web/src/provider/multi-provider/status-tracker.ts
new file mode 100644
index 000000000..8fdef11c0
--- /dev/null
+++ b/packages/web/src/provider/multi-provider/status-tracker.ts
@@ -0,0 +1,75 @@
+import type { EventDetails } from '@openfeature/core';
+import type { OpenFeatureEventEmitter } from '../../events';
+import { ProviderEvents } from '../../events';
+import { ProviderStatus } from '../provider';
+import type { RegisteredProvider } from './types';
+
+/**
+ * Tracks each individual provider's status by listening to emitted events
+ * Maintains an overall "status" for the multi provider which represents the "most critical" status out of all providers
+ */
+export class StatusTracker {
+  private readonly providerStatuses: Record<string, ProviderStatus> = {};
+
+  constructor(private events: OpenFeatureEventEmitter) {}
+
+  wrapEventHandler(providerEntry: RegisteredProvider) {
+    const provider = providerEntry.provider;
+    provider.events?.addHandler(ProviderEvents.Error, (details?: EventDetails) => {
+      this.changeProviderStatus(providerEntry.name, ProviderStatus.ERROR, details);
+    });
+
+    provider.events?.addHandler(ProviderEvents.Stale, (details?: EventDetails) => {
+      this.changeProviderStatus(providerEntry.name, ProviderStatus.STALE, details);
+    });
+
+    provider.events?.addHandler(ProviderEvents.ConfigurationChanged, (details?: EventDetails) => {
+      this.events.emit(ProviderEvents.ConfigurationChanged, details);
+    });
+
+    provider.events?.addHandler(ProviderEvents.Ready, (details?: EventDetails) => {
+      this.changeProviderStatus(providerEntry.name, ProviderStatus.READY, details);
+    });
+
+    provider.events?.addHandler(ProviderEvents.Reconciling, (details?: EventDetails) => {
+      this.changeProviderStatus(providerEntry.name, ProviderStatus.RECONCILING, details);
+    });
+  }
+
+  providerStatus(name: string) {
+    return this.providerStatuses[name];
+  }
+
+  private getStatusFromProviderStatuses() {
+    const statuses = Object.values(this.providerStatuses);
+    if (statuses.includes(ProviderStatus.FATAL)) {
+      return ProviderStatus.FATAL;
+    } else if (statuses.includes(ProviderStatus.NOT_READY)) {
+      return ProviderStatus.NOT_READY;
+    } else if (statuses.includes(ProviderStatus.ERROR)) {
+      return ProviderStatus.ERROR;
+    } else if (statuses.includes(ProviderStatus.STALE)) {
+      return ProviderStatus.STALE;
+    } else if (statuses.includes(ProviderStatus.RECONCILING)) {
+      return ProviderStatus.RECONCILING;
+    }
+    return ProviderStatus.READY;
+  }
+
+  private changeProviderStatus(name: string, status: ProviderStatus, details?: EventDetails) {
+    const currentStatus = this.getStatusFromProviderStatuses();
+    this.providerStatuses[name] = status;
+    const newStatus = this.getStatusFromProviderStatuses();
+    if (currentStatus !== newStatus) {
+      if (newStatus === ProviderStatus.FATAL || newStatus === ProviderStatus.ERROR) {
+        this.events.emit(ProviderEvents.Error, details);
+      } else if (newStatus === ProviderStatus.STALE) {
+        this.events.emit(ProviderEvents.Stale, details);
+      } else if (newStatus === ProviderStatus.READY) {
+        this.events.emit(ProviderEvents.Ready, details);
+      } else if (newStatus === ProviderStatus.RECONCILING) {
+        this.events.emit(ProviderEvents.Reconciling, details);
+      }
+    }
+  }
+}
diff --git a/packages/web/src/provider/multi-provider/strategies/base-evaluation-strategy.ts b/packages/web/src/provider/multi-provider/strategies/base-evaluation-strategy.ts
new file mode 100644
index 000000000..3105b1403
--- /dev/null
+++ b/packages/web/src/provider/multi-provider/strategies/base-evaluation-strategy.ts
@@ -0,0 +1,128 @@
+import type {
+  ErrorCode,
+  EvaluationContext,
+  FlagValue,
+  FlagValueType,
+  OpenFeatureError,
+  ResolutionDetails,
+  TrackingEventDetails,
+} from '@openfeature/core';
+import type { Provider } from '../../provider';
+import { ProviderStatus } from '../../provider';
+import { ErrorWithCode } from '../errors';
+
+export type StrategyEvaluationContext = {
+  flagKey: string;
+  flagType: FlagValueType;
+};
+export type StrategyProviderContext = {
+  provider: Provider;
+  providerName: string;
+  providerStatus: ProviderStatus;
+};
+export type StrategyPerProviderContext = StrategyEvaluationContext & StrategyProviderContext;
+
+type ProviderResolutionResultBase = {
+  provider: Provider;
+  providerName: string;
+};
+
+export type ProviderResolutionSuccessResult<T extends FlagValue> = ProviderResolutionResultBase & {
+  details: ResolutionDetails<T>;
+};
+
+export type ProviderResolutionErrorResult = ProviderResolutionResultBase & {
+  thrownError: unknown;
+};
+
+export type ProviderResolutionResult<T extends FlagValue> =
+  | ProviderResolutionSuccessResult<T>
+  | ProviderResolutionErrorResult;
+
+export type FinalResult<T extends FlagValue> = {
+  details?: ResolutionDetails<T>;
+  provider?: Provider;
+  providerName?: string;
+  errors?: {
+    providerName: string;
+    error: unknown;
+  }[];
+};
+
+/**
+ * Base strategy to inherit from. Not directly usable, as strategies must implement the "determineResult" method
+ * Contains default implementations for `shouldEvaluateThisProvider` and `shouldEvaluateNextProvider`
+ */
+export abstract class BaseEvaluationStrategy {
+  shouldEvaluateThisProvider(strategyContext: StrategyPerProviderContext, _evalContext: EvaluationContext): boolean {
+    if (
+      strategyContext.providerStatus === ProviderStatus.NOT_READY ||
+      strategyContext.providerStatus === ProviderStatus.FATAL
+    ) {
+      return false;
+    }
+    return true;
+  }
+
+  shouldEvaluateNextProvider<T extends FlagValue>(
+    _strategyContext: StrategyPerProviderContext,
+    _context: EvaluationContext,
+    _result: ProviderResolutionResult<T>,
+  ): boolean {
+    return true;
+  }
+
+  shouldTrackWithThisProvider(
+    strategyContext: StrategyProviderContext,
+    _context: EvaluationContext,
+    _trackingEventName: string,
+    _trackingEventDetails: TrackingEventDetails,
+  ): boolean {
+    if (
+      strategyContext.providerStatus === ProviderStatus.NOT_READY ||
+      strategyContext.providerStatus === ProviderStatus.FATAL
+    ) {
+      return false;
+    }
+    return true;
+  }
+
+  abstract determineFinalResult<T extends FlagValue>(
+    strategyContext: StrategyEvaluationContext,
+    context: EvaluationContext,
+    resolutions: ProviderResolutionResult<T>[],
+  ): FinalResult<T>;
+
+  protected hasError(resolution: ProviderResolutionResult<FlagValue>): resolution is
+    | ProviderResolutionErrorResult
+    | (ProviderResolutionSuccessResult<FlagValue> & {
+        details: ResolutionDetails<FlagValue> & { errorCode: ErrorCode };
+      }) {
+    return 'thrownError' in resolution || !!resolution.details.errorCode;
+  }
+
+  protected hasErrorWithCode(resolution: ProviderResolutionResult<FlagValue>, code: ErrorCode): boolean {
+    return 'thrownError' in resolution
+      ? (resolution.thrownError as OpenFeatureError)?.code === code
+      : resolution.details.errorCode === code;
+  }
+
+  protected collectProviderErrors<T extends FlagValue>(resolutions: ProviderResolutionResult<T>[]): FinalResult<T> {
+    const errors: FinalResult<FlagValue>['errors'] = [];
+    for (const resolution of resolutions) {
+      if ('thrownError' in resolution) {
+        errors.push({ providerName: resolution.providerName, error: resolution.thrownError });
+      } else if (resolution.details.errorCode) {
+        errors.push({
+          providerName: resolution.providerName,
+          error: new ErrorWithCode(resolution.details.errorCode, resolution.details.errorMessage ?? 'unknown error'),
+        });
+      }
+    }
+    return { errors };
+  }
+
+  protected resolutionToFinalResult<T extends FlagValue>(resolution: ProviderResolutionSuccessResult<T>) {
+    return { details: resolution.details, provider: resolution.provider, providerName: resolution.providerName };
+  }
+}
diff --git a/packages/web/src/provider/multi-provider/strategies/comparison-strategy.ts b/packages/web/src/provider/multi-provider/strategies/comparison-strategy.ts
new file mode 100644
index 000000000..64855c4da
--- /dev/null
+++ b/packages/web/src/provider/multi-provider/strategies/comparison-strategy.ts
@@ -0,0 +1,70 @@
+import type {
+  FinalResult,
+  ProviderResolutionResult,
+  ProviderResolutionSuccessResult,
+  StrategyPerProviderContext,
+} from './base-evaluation-strategy';
+import { BaseEvaluationStrategy } from './base-evaluation-strategy';
+import type { EvaluationContext, FlagValue } from '@openfeature/core';
+import type { Provider } from '../../provider';
+import { GeneralError } from '@openfeature/core';
+
+/**
+ * Evaluate all providers and compare the results.
+ * If the values agree, return the value
+ * If the values disagree, return the value from the configured "fallback provider" and execute the "onMismatch"
+ * callback if defined
+ */
+export class ComparisonStrategy extends BaseEvaluationStrategy {
+  constructor(
+    private fallbackProvider: Provider,
+    private onMismatch?: (resolutions: ProviderResolutionResult<FlagValue>[]) => void,
+  ) {
+    super();
+  }
+
+  override determineFinalResult<T extends FlagValue>(
+    strategyContext: StrategyPerProviderContext,
+    context: EvaluationContext,
+    resolutions: ProviderResolutionResult<T>[],
+  ): FinalResult<T> {
+    let value: T | undefined;
+    let fallbackResolution: ProviderResolutionSuccessResult<T> | undefined;
+    let finalResolution: ProviderResolutionSuccessResult<T> | undefined;
+    let mismatch = false;
+    for (const [i, resolution] of resolutions.entries()) {
+      if (this.hasError(resolution)) {
+        return this.collectProviderErrors(resolutions);
+      }
+      if (resolution.provider === this.fallbackProvider) {
+        fallbackResolution = resolution;
+      }
+      if (i === 0) {
+        finalResolution = resolution;
+      }
+      if (typeof value !== 'undefined' && value !== resolution.details.value) {
+        mismatch = true;
+      } else {
+        value = resolution.details.value;
+      }
+    }
+
+    if (!fallbackResolution) {
+      throw new GeneralError('Fallback provider not found in resolution results');
+    }
+
+    if (!finalResolution) {
+      throw new GeneralError('Final resolution not found in resolution results');
+    }
+
+    if (mismatch) {
+      this.onMismatch?.(resolutions);
+      return {
+        details: fallbackResolution.details,
+        provider: fallbackResolution.provider,
+      };
+    }
+
+    return this.resolutionToFinalResult(finalResolution);
+  }
+}
diff --git a/packages/web/src/provider/multi-provider/strategies/first-match-strategy.ts b/packages/web/src/provider/multi-provider/strategies/first-match-strategy.ts
new file mode 100644
index 000000000..375378d58
--- /dev/null
+++ b/packages/web/src/provider/multi-provider/strategies/first-match-strategy.ts
@@ -0,0 +1,36 @@
+import type { FinalResult, ProviderResolutionResult, StrategyPerProviderContext } from './base-evaluation-strategy';
+import { BaseEvaluationStrategy } from './base-evaluation-strategy';
+import type { EvaluationContext, FlagValue } from '@openfeature/core';
+import { ErrorCode } from '@openfeature/core';
+
+/**
+ * Return the first result that did not indicate "flag not found".
+ * If any provider in the course of evaluation returns or throws an error, throw that error
+ */
+export class FirstMatchStrategy extends BaseEvaluationStrategy {
+  override shouldEvaluateNextProvider<T extends FlagValue>(
+    strategyContext: StrategyPerProviderContext,
+    context: EvaluationContext,
+    result: ProviderResolutionResult<T>,
+  ): boolean {
+    if (this.hasErrorWithCode(result, ErrorCode.FLAG_NOT_FOUND)) {
+      return true;
+    }
+    if (this.hasError(result)) {
+      return false;
+    }
+    return false;
+  }
+
+  override determineFinalResult<T extends FlagValue>(
+    strategyContext: StrategyPerProviderContext,
+    context: EvaluationContext,
+    resolutions: ProviderResolutionResult<T>[],
+  ): FinalResult<T> {
+    const finalResolution = resolutions[resolutions.length - 1];
+    if (this.hasError(finalResolution)) {
+      return this.collectProviderErrors(resolutions);
+    }
+    return this.resolutionToFinalResult(finalResolution);
+  }
+}
diff --git a/packages/web/src/provider/multi-provider/strategies/first-successful-strategy.ts b/packages/web/src/provider/multi-provider/strategies/first-successful-strategy.ts
new file mode 100644
index 000000000..779eb69d3
--- /dev/null
+++ b/packages/web/src/provider/multi-provider/strategies/first-successful-strategy.ts
@@ -0,0 +1,31 @@
+import type { FinalResult, ProviderResolutionResult, StrategyPerProviderContext } from './base-evaluation-strategy';
+import { BaseEvaluationStrategy } from './base-evaluation-strategy';
+import type { EvaluationContext, FlagValue } from '@openfeature/core';
+
+/**
+ * Return the first result that did NOT result in an error
+ * If any provider in the course of evaluation returns or throws an error, ignore it as long as there is a successful result
+ * If there is no successful result, throw all errors
+ */
+export class FirstSuccessfulStrategy extends BaseEvaluationStrategy {
+  override shouldEvaluateNextProvider<T extends FlagValue>(
+    strategyContext: StrategyPerProviderContext,
+    context: EvaluationContext,
+    result: ProviderResolutionResult<T>,
+  ): boolean {
+    // evaluate next only if there was an error
+    return this.hasError(result);
+  }
+
+  override determineFinalResult<T extends FlagValue>(
+    strategyContext: StrategyPerProviderContext,
+    context: EvaluationContext,
+    resolutions: ProviderResolutionResult<T>[],
+  ): FinalResult<T> {
+    const finalResolution = resolutions[resolutions.length - 1];
+    if (this.hasError(finalResolution)) {
+      return this.collectProviderErrors(resolutions);
+    }
+    return this.resolutionToFinalResult(finalResolution);
+  }
+}
diff --git a/packages/web/src/provider/multi-provider/strategies/index.ts b/packages/web/src/provider/multi-provider/strategies/index.ts
new file mode 100644
index 000000000..c611ac485
--- /dev/null
+++ b/packages/web/src/provider/multi-provider/strategies/index.ts
@@ -0,0 +1,4 @@
+export * from './base-evaluation-strategy';
+export * from './first-match-strategy';
+export * from './first-successful-strategy';
+export * from './comparison-strategy';
diff --git a/packages/web/src/provider/multi-provider/types.ts b/packages/web/src/provider/multi-provider/types.ts
new file mode 100644
index 000000000..1e2747bb3
--- /dev/null
+++ b/packages/web/src/provider/multi-provider/types.ts
@@ -0,0 +1,10 @@
+// Represents an entry in the constructor's provider array which may or may not have a name set
+import type { Provider } from '../provider';
+
+export type ProviderEntryInput = {
+  provider: Provider;
+  name?: string;
+};
+
+// Represents a processed and "registered" provider entry where a name has been chosen
+export type RegisteredProvider = Required<ProviderEntryInput>;
diff --git a/packages/web/test/evaluation-context.spec.ts b/packages/web/test/evaluation-context.spec.ts
index 7de3b8edc..288301c88 100644
--- a/packages/web/test/evaluation-context.spec.ts
+++ b/packages/web/test/evaluation-context.spec.ts
@@ -12,13 +12,11 @@ class MockProvider implements Provider {
 
   initialize = initializeMock;
 
-  // eslint-disable-next-line @typescript-eslint/no-unused-vars
-  onContextChange(oldContext: EvaluationContext, newContext: EvaluationContext): Promise<void> {
+  onContextChange(_oldContext: EvaluationContext, _newContext: EvaluationContext): Promise<void> {
     return Promise.resolve();
   }
 
-  // eslint-disable-next-line @typescript-eslint/no-unused-vars
-  resolveBooleanEvaluation = jest.fn((flagKey: string, defaultValue: boolean, context: EvaluationContext) => {
+  resolveBooleanEvaluation = jest.fn((_flagKey: string, _defaultValue: boolean, _context: EvaluationContext) => {
     return {
       value: true,
     };
diff --git a/packages/web/test/multi-provider-web.spec.ts b/packages/web/test/multi-provider-web.spec.ts
new file mode 100644
index 000000000..d6e256010
--- /dev/null
+++ b/packages/web/test/multi-provider-web.spec.ts
@@ -0,0 +1,894 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
+import { MultiProvider } from '../src/provider/multi-provider/multi-provider-web';
+import type {
+  EvaluationContext,
+  FlagValue,
+  FlagValueType,
+  Hook,
+  Logger,
+  Provider,
+  ProviderEmittableEvents,
+  ProviderMetadata,
+  TrackingEventDetails,
+} from '@openfeature/web-sdk';
+import {
+  DefaultLogger,
+  MapHookData,
+  ErrorCode,
+  FlagNotFoundError,
+  InMemoryProvider,
+  OpenFeatureEventEmitter,
+  ClientProviderEvents,
+} from '@openfeature/web-sdk';
+import { FirstMatchStrategy } from '../src/provider/multi-provider/strategies';
+import { FirstSuccessfulStrategy } from '../src/provider/multi-provider/strategies';
+import { ComparisonStrategy } from '../src/provider/multi-provider/strategies';
+
+class TestProvider implements Provider {
+  public metadata: ProviderMetadata = {
+    name: 'TestProvider',
+  };
+  public events = new OpenFeatureEventEmitter();
+  public hooks: Hook[] = [];
+  public track = jest.fn();
+  constructor(
+    public resolveBooleanEvaluation = jest.fn().mockReturnValue({ value: false }),
+    public resolveStringEvaluation = jest.fn().mockReturnValue({ value: 'default' }),
+    public resolveObjectEvaluation = jest.fn().mockReturnValue({ value: {} }),
+    public resolveNumberEvaluation = jest.fn().mockReturnValue({ value: 0 }),
+    public initialize = jest.fn(),
+  ) {}
+
+  emitEvent(type: ProviderEmittableEvents) {
+    this.events.emit(type, { providerName: this.metadata.name });
+  }
+}
+
+const callEvaluation = (multi: MultiProvider, context: EvaluationContext) => {
+  callBeforeHook(multi, context, 'flag', 'boolean', false);
+  return multi.resolveBooleanEvaluation('flag', false, context);
+};
+
+const callBeforeHook = (
+  multi: MultiProvider,
+  context: EvaluationContext,
+  flagKey: string,
+  flagType: FlagValueType,
+  defaultValue: FlagValue,
+  logger: Logger = new DefaultLogger(),
+) => {
+  const hookContext = {
+    context: context,
+    flagKey,
+    flagValueType: flagType,
+    defaultValue,
+    clientMetadata: {} as any,
+    providerMetadata: {} as any,
+    logger: logger,
+    hookData: new MapHookData(),
+  };
+  multi.hooks[0].before?.(hookContext);
+};
+
+describe('MultiProvider', () => {
+  const logger = new DefaultLogger();
+
+  describe('unique names', () => {
+    it('uses provider names for unique types', () => {
+      const multiProvider = new MultiProvider([
+        {
+          provider: new InMemoryProvider(),
+        },
+        {
+          provider: new TestProvider(),
+        },
+      ]);
+      expect(multiProvider.providerEntries[0].name).toEqual('in-memory');
+      expect(multiProvider.providerEntries[1].name).toEqual('TestProvider');
+      expect(multiProvider.providerEntries.length).toBe(2);
+    });
+    it('generates unique names for identical provider types', () => {
+      const multiProvider = new MultiProvider([
+        {
+          provider: new TestProvider(),
+        },
+        {
+          provider: new TestProvider(),
+        },
+        {
+          provider: new TestProvider(),
+        },
+        {
+          provider: new InMemoryProvider(),
+        },
+      ]);
+      expect(multiProvider.providerEntries[0].name).toEqual('TestProvider-1');
+      expect(multiProvider.providerEntries[1].name).toEqual('TestProvider-2');
+      expect(multiProvider.providerEntries[2].name).toEqual('TestProvider-3');
+      expect(multiProvider.providerEntries[3].name).toEqual('in-memory');
+      expect(multiProvider.providerEntries.length).toBe(4);
+    });
+    it('uses specified names for identical provider types', () => {
+      const multiProvider = new MultiProvider([
+        {
+          provider: new TestProvider(),
+          name: 'provider1',
+        },
+        {
+          provider: new TestProvider(),
+          name: 'provider2',
+        },
+      ]);
+      expect(multiProvider.providerEntries[0].name).toEqual('provider1');
+      expect(multiProvider.providerEntries[1].name).toEqual('provider2');
+      expect(multiProvider.providerEntries.length).toBe(2);
+    });
+    it('throws an error if specified names are not unique', () => {
+      expect(
+        () =>
+          new MultiProvider([
+            {
+              provider: new TestProvider(),
+              name: 'provider',
+            },
+            {
+              provider: new InMemoryProvider(),
+              name: 'provider',
+            },
+          ]),
+      ).toThrow();
+    });
+  });
+
+  describe('event tracking and statuses', () => {
+    it('initializes by waiting for all initializations', async () => {
+      const provider1 = new TestProvider();
+      const provider2 = new TestProvider();
+      let initializations = 0;
+      const multiProvider = new MultiProvider([
+        {
+          provider: provider1,
+        },
+        {
+          provider: provider2,
+        },
+      ]);
+      provider1.initialize.mockImplementation(async () => {
+        await new Promise((resolve) => setTimeout(resolve, 1));
+        initializations++;
+      });
+      provider2.initialize.mockImplementation(() => initializations++);
+      await multiProvider.initialize();
+      expect(initializations).toBe(2);
+    });
+
+    it('throws error if a provider errors on initialization', async () => {
+      const provider1 = new TestProvider();
+      const provider2 = new TestProvider();
+      let initializations = 0;
+      const multiProvider = new MultiProvider([
+        {
+          provider: provider1,
+        },
+        {
+          provider: provider2,
+        },
+      ]);
+      provider1.initialize.mockImplementation(async () => {
+        await new Promise((resolve) => setTimeout(resolve, 1));
+        throw new Error('Failure!');
+      });
+      provider2.initialize.mockImplementation(async () => initializations++);
+      await expect(() => multiProvider.initialize()).rejects.toThrow('Failure!');
+    });
+
+    it('emits events when aggregate status changes', async () => {
+      const provider1 = new TestProvider();
+      const provider2 = new TestProvider();
+      const multiProvider = new MultiProvider([
+        {
+          provider: provider1,
+        },
+        {
+          provider: provider2,
+        },
+      ]);
+
+      let readyEmitted = 0;
+      let errorEmitted = 0;
+      let staleEmitted = 0;
+      multiProvider.events.addHandler(ClientProviderEvents.Ready, () => {
+        readyEmitted++;
+      });
+
+      multiProvider.events.addHandler(ClientProviderEvents.Error, () => {
+        errorEmitted++;
+      });
+
+      multiProvider.events.addHandler(ClientProviderEvents.Stale, () => {
+        staleEmitted++;
+      });
+
+      await multiProvider.initialize();
+
+      provider1.initialize.mockResolvedValue(true);
+      provider2.initialize.mockResolvedValue(true);
+      provider1.emitEvent(ClientProviderEvents.Error);
+      expect(errorEmitted).toBe(1);
+      provider2.emitEvent(ClientProviderEvents.Error);
+      // don't emit error again unless aggregate status is changing
+      expect(errorEmitted).toBe(1);
+      provider1.emitEvent(ClientProviderEvents.Error);
+      // don't emit error again unless aggregate status is changing
+      expect(errorEmitted).toBe(1);
+      provider2.emitEvent(ClientProviderEvents.Stale);
+      provider1.emitEvent(ClientProviderEvents.Ready);
+      // error status provider is ready now but other provider is stale
+      expect(readyEmitted).toBe(0);
+      expect(staleEmitted).toBe(1);
+      provider2.emitEvent(ClientProviderEvents.Ready);
+      // now both providers are ready
+      expect(readyEmitted).toBe(1);
+    });
+  });
+
+  describe('metadata', () => {
+    it('contains metadata for all providers', () => {
+      const provider1 = new TestProvider();
+      const provider2 = new TestProvider();
+
+      const multiProvider = new MultiProvider([
+        {
+          provider: provider1,
+        },
+        {
+          provider: provider2,
+        },
+      ]);
+      expect(multiProvider.metadata).toEqual({
+        name: 'MultiProvider',
+        'TestProvider-1': provider1.metadata,
+        'TestProvider-2': provider2.metadata,
+      });
+    });
+  });
+
+  describe('evaluation', () => {
+    describe('hooks', () => {
+      it("runs all providers' before hooks before evaluation, using same hook context", () => {
+        const provider1 = new TestProvider();
+        const provider2 = new TestProvider();
+        let hook1Called = false;
+        let hook2Called = false;
+        let after1Called = false;
+        let after2Called = false;
+        const context = {
+          test: true,
+        };
+        const hookContext = {
+          context: context,
+          flagKey: 'flag',
+          flagValueType: 'boolean' as any,
+          defaultValue: false,
+          clientMetadata: {} as any,
+          providerMetadata: {} as any,
+          logger: logger,
+          hookData: new MapHookData(),
+        };
+
+        provider1.hooks = [
+          {
+            before: (context) => {
+              hook1Called = true;
+              expect(context).toEqual(hookContext);
+            },
+            after: (context) => {
+              expect(context).toEqual(hookContext);
+              after1Called = true;
+            },
+          },
+          {
+            before: (context) => {
+              expect(context).toEqual(hookContext);
+              hook2Called = true;
+            },
+          },
+        ];
+
+        provider2.hooks = [
+          {
+            after: (context) => {
+              expect(context).toEqual(hookContext);
+              after2Called = true;
+            },
+          },
+        ];
+
+        const multiProvider = new MultiProvider(
+          [
+            {
+              provider: provider1,
+            },
+            {
+              provider: provider2,
+            },
+          ],
+          new ComparisonStrategy(provider1),
+        );
+
+        multiProvider.hooks[0].before?.(hookContext);
+        multiProvider.resolveBooleanEvaluation('flag', false, context);
+        expect(hook1Called).toBe(true);
+        expect(hook2Called).toBe(true);
+        expect(provider1.resolveBooleanEvaluation).toHaveBeenCalledWith(
+          'flag',
+          false,
+          { test: true },
+          expect.any(Object),
+        );
+        expect(provider2.resolveBooleanEvaluation).toHaveBeenCalledWith(
+          'flag',
+          false,
+          { test: true },
+          expect.any(Object),
+        );
+        expect(after1Called).toBe(true);
+        expect(after2Called).toBe(true);
+      });
+
+      it('runs error hook and finally hook', () => {
+        const provider1 = new TestProvider();
+        let error1Called = false;
+        let finally1Called = false;
+
+        const context = {
+          test: true,
+        };
+
+        const hookContext = {
+          context: context,
+          flagKey: 'flag',
+          flagValueType: 'boolean' as any,
+          defaultValue: false,
+          clientMetadata: {} as any,
+          providerMetadata: {} as any,
+          logger: logger,
+          hookData: new MapHookData(),
+        };
+
+        provider1.hooks = [
+          {
+            error: async (context) => {
+              expect(context).toEqual(hookContext);
+              error1Called = true;
+            },
+            finally: async (context) => {
+              expect(context).toEqual(hookContext);
+              finally1Called = true;
+            },
+          },
+        ];
+
+        const multiProvider = new MultiProvider([
+          {
+            provider: provider1,
+          },
+        ]);
+
+        provider1.resolveBooleanEvaluation.mockImplementation(() => {
+          throw new Error('test error');
+        });
+
+        multiProvider.hooks[0].before?.(hookContext);
+        expect(() => multiProvider.resolveBooleanEvaluation('flag', false, context)).toThrow();
+        expect(error1Called).toBe(true);
+        expect(finally1Called).toBe(true);
+      });
+    });
+
+    describe('resolution logic and strategies', () => {
+      describe('evaluation data types', () => {
+        it('evaluates a string variable', () => {
+          const provider1 = new TestProvider();
+          provider1.resolveStringEvaluation.mockReturnValue({ value: 'value' });
+
+          const multiProvider = new MultiProvider([
+            {
+              provider: provider1,
+            },
+          ]);
+          const context = {};
+          callBeforeHook(multiProvider, context, 'flag', 'string', 'default');
+          expect(multiProvider.resolveStringEvaluation('flag', 'default', context)).toEqual({
+            value: 'value',
+            flagKey: 'flag',
+            flagMetadata: {},
+          });
+        });
+
+        it('evaluates a number variable', () => {
+          const provider1 = new TestProvider();
+          provider1.resolveNumberEvaluation.mockReturnValue({ value: 1 });
+
+          const multiProvider = new MultiProvider([
+            {
+              provider: provider1,
+            },
+          ]);
+          const context = {};
+
+          callBeforeHook(multiProvider, context, 'flag', 'number', 0);
+
+          expect(multiProvider.resolveNumberEvaluation('flag', 0, context)).toEqual({
+            value: 1,
+            flagKey: 'flag',
+            flagMetadata: {},
+          });
+        });
+
+        it('evaluates a boolean variable', () => {
+          const provider1 = new TestProvider();
+          provider1.resolveBooleanEvaluation.mockReturnValue({ value: true });
+
+          const multiProvider = new MultiProvider([
+            {
+              provider: provider1,
+            },
+          ]);
+          const context = {};
+          callBeforeHook(multiProvider, context, 'flag', 'boolean', false);
+          expect(multiProvider.resolveBooleanEvaluation('flag', false, context)).toEqual({
+            value: true,
+            flagKey: 'flag',
+            flagMetadata: {},
+          });
+        });
+
+        it('evaluates an object variable', () => {
+          const provider1 = new TestProvider();
+          provider1.resolveObjectEvaluation.mockReturnValue({ value: { test: true } });
+
+          const multiProvider = new MultiProvider([
+            {
+              provider: provider1,
+            },
+          ]);
+          const context = {};
+          callBeforeHook(multiProvider, context, 'flag', 'object', {});
+          expect(multiProvider.resolveObjectEvaluation('flag', {}, context)).toEqual({
+            value: { test: true },
+            flagKey: 'flag',
+            flagMetadata: {},
+          });
+        });
+      });
+      describe('first match strategy', () => {
+        it('throws an error if any provider throws an error during evaluation', () => {
+          const provider1 = new TestProvider();
+          const provider2 = new TestProvider();
+          provider1.resolveBooleanEvaluation.mockImplementation(() => {
+            throw new Error('test error');
+          });
+          const multiProvider = new MultiProvider(
+            [
+              {
+                provider: provider1,
+              },
+              {
+                provider: provider2,
+              },
+            ],
+            new FirstMatchStrategy(),
+          );
+
+          expect(() => callEvaluation(multiProvider, {})).toThrow('test error');
+          expect(provider2.resolveBooleanEvaluation).not.toHaveBeenCalled();
+        });
+
+        it('throws an error if any provider returns an error result during evaluation', () => {
+          const provider1 = new TestProvider();
+          const provider2 = new TestProvider();
+          provider1.resolveBooleanEvaluation.mockReturnValue({
+            errorCode: 'test-error',
+            errorMessage: 'test error',
+          });
+          const multiProvider = new MultiProvider(
+            [
+              {
+                provider: provider1,
+              },
+              {
+                provider: provider2,
+              },
+            ],
+            new FirstMatchStrategy(),
+          );
+
+          expect(() => callEvaluation(multiProvider, {})).toThrow('test error');
+          expect(provider2.resolveBooleanEvaluation).not.toHaveBeenCalled();
+        });
+
+        it('skips providers that return flag not found until it gets a result, skipping any provider after', () => {
+          const provider1 = new TestProvider();
+          const provider2 = new TestProvider();
+          const provider3 = new TestProvider();
+          provider1.resolveBooleanEvaluation.mockReturnValue({
+            errorCode: ErrorCode.FLAG_NOT_FOUND,
+            errorMessage: 'flag not found',
+          });
+          provider2.resolveBooleanEvaluation.mockReturnValue({
+            value: true,
+          });
+          const multiProvider = new MultiProvider(
+            [
+              {
+                provider: provider1,
+              },
+              {
+                provider: provider2,
+              },
+              {
+                provider: provider3,
+              },
+            ],
+            new FirstMatchStrategy(),
+          );
+          const result = callEvaluation(multiProvider, {});
+          expect(result).toEqual({ value: true, flagKey: 'flag', flagMetadata: {} });
+          expect(provider2.resolveBooleanEvaluation).toHaveBeenCalled();
+          expect(provider3.resolveBooleanEvaluation).not.toHaveBeenCalled();
+        });
+
+        it('skips providers that throw flag not found until it gets a result, skipping any provider after', () => {
+          const provider1 = new TestProvider();
+          const provider2 = new TestProvider();
+          const provider3 = new TestProvider();
+          provider1.resolveBooleanEvaluation.mockImplementation(() => {
+            throw new FlagNotFoundError('flag not found');
+          });
+          provider2.resolveBooleanEvaluation.mockReturnValue({
+            value: true,
+          });
+          const multiProvider = new MultiProvider(
+            [
+              {
+                provider: provider1,
+              },
+              {
+                provider: provider2,
+              },
+              {
+                provider: provider3,
+              },
+            ],
+            new FirstMatchStrategy(),
+          );
+          const result = callEvaluation(multiProvider, {});
+          expect(result).toEqual({ value: true, flagKey: 'flag', flagMetadata: {} });
+          expect(provider2.resolveBooleanEvaluation).toHaveBeenCalled();
+          expect(provider3.resolveBooleanEvaluation).not.toHaveBeenCalled();
+        });
+      });
+
+      describe('first successful strategy', () => {
+        it('ignores errors from earlier providers and returns successful result from later provider', () => {
+          const provider1 = new TestProvider();
+          const provider2 = new TestProvider();
+          const provider3 = new TestProvider();
+          provider1.resolveBooleanEvaluation.mockReturnValue({
+            errorCode: 'some error',
+            errorMessage: 'flag not found',
+          });
+          provider2.resolveBooleanEvaluation.mockReturnValue({
+            value: true,
+          });
+          const multiProvider = new MultiProvider(
+            [
+              {
+                provider: provider1,
+              },
+              {
+                provider: provider2,
+              },
+              {
+                provider: provider3,
+              },
+            ],
+            new FirstSuccessfulStrategy(),
+          );
+          const result = callEvaluation(multiProvider, {});
+          expect(result).toEqual({ value: true, flagKey: 'flag', flagMetadata: {} });
+          expect(provider2.resolveBooleanEvaluation).toHaveBeenCalled();
+          expect(provider3.resolveBooleanEvaluation).not.toHaveBeenCalled();
+        });
+      });
+
+      describe('comparison strategy', () => {
+        it('calls every provider and returns a result if they all agree', () => {
+          const provider1 = new TestProvider();
+          const provider2 = new TestProvider();
+          const provider3 = new TestProvider();
+          provider1.resolveBooleanEvaluation.mockReturnValue({ value: true });
+
+          provider2.resolveBooleanEvaluation.mockReturnValue({ value: true });
+          provider3.resolveBooleanEvaluation.mockReturnValue({ value: true });
+
+          const multiProvider = new MultiProvider(
+            [
+              {
+                provider: provider1,
+              },
+              {
+                provider: provider2,
+              },
+              {
+                provider: provider3,
+              },
+            ],
+            new ComparisonStrategy(provider1),
+          );
+          const result = callEvaluation(multiProvider, {});
+          expect(provider1.resolveBooleanEvaluation).toHaveBeenCalled();
+          expect(provider2.resolveBooleanEvaluation).toHaveBeenCalled();
+          expect(provider3.resolveBooleanEvaluation).toHaveBeenCalled();
+
+          expect(result).toEqual({ value: true, flagKey: 'flag', flagMetadata: {} });
+        });
+
+        it('calls every provider and returns the fallback value if any disagree, and calls onMismatch', () => {
+          const provider1 = new TestProvider();
+          const provider2 = new TestProvider();
+          const provider3 = new TestProvider();
+          provider1.resolveBooleanEvaluation.mockReturnValue({
+            value: true,
+          });
+          provider2.resolveBooleanEvaluation.mockReturnValue({
+            value: false,
+          });
+          provider3.resolveBooleanEvaluation.mockReturnValue({
+            value: false,
+          });
+
+          const onMismatch = jest.fn();
+
+          const multiProvider = new MultiProvider(
+            [
+              {
+                provider: provider1,
+              },
+              {
+                provider: provider2,
+              },
+              {
+                provider: provider3,
+              },
+            ],
+            new ComparisonStrategy(provider1, onMismatch),
+          );
+          const result = callEvaluation(multiProvider, {});
+          expect(provider1.resolveBooleanEvaluation).toHaveBeenCalled();
+          expect(provider2.resolveBooleanEvaluation).toHaveBeenCalled();
+          expect(provider3.resolveBooleanEvaluation).toHaveBeenCalled();
+          expect(onMismatch).toHaveBeenCalledWith([
+            {
+              provider: provider1,
+              providerName: 'TestProvider-1',
+              details: { value: true, flagKey: 'flag', flagMetadata: {} },
+            },
+            {
+              provider: provider2,
+              providerName: 'TestProvider-2',
+              details: { value: false, flagKey: 'flag', flagMetadata: {} },
+            },
+            {
+              provider: provider3,
+              providerName: 'TestProvider-3',
+              details: { value: false, flagKey: 'flag', flagMetadata: {} },
+            },
+          ]);
+
+          expect(result).toEqual({ value: true, flagKey: 'flag', flagMetadata: {} });
+        });
+
+        it('returns an error if any provider returns an error', () => {
+          const provider1 = new TestProvider();
+          const provider2 = new TestProvider();
+          const provider3 = new TestProvider();
+          provider1.resolveBooleanEvaluation.mockImplementation(() => {
+            throw new Error('test error');
+          });
+          provider2.resolveBooleanEvaluation.mockReturnValue({
+            value: false,
+          });
+          provider3.resolveBooleanEvaluation.mockReturnValue({
+            value: false,
+          });
+
+          const multiProvider = new MultiProvider(
+            [
+              {
+                provider: provider1,
+              },
+              {
+                provider: provider2,
+              },
+              {
+                provider: provider3,
+              },
+            ],
+            new ComparisonStrategy(provider1),
+          );
+          expect(() => callEvaluation(multiProvider, {})).toThrow('test error');
+          expect(provider1.resolveBooleanEvaluation).toHaveBeenCalled();
+          expect(provider2.resolveBooleanEvaluation).toHaveBeenCalled();
+          expect(provider3.resolveBooleanEvaluation).toHaveBeenCalled();
+        });
+      });
+    });
+
+    describe('tracking', () => {
+      const context: EvaluationContext = { targetingKey: 'user123' };
+      const trackingEventDetails: TrackingEventDetails = { value: 100, currency: 'USD' };
+
+      it('calls track on all providers by default', () => {
+        const provider1 = new TestProvider();
+        const provider2 = new TestProvider();
+        const provider3 = new TestProvider();
+
+        const multiProvider = new MultiProvider([
+          { provider: provider1 },
+          { provider: provider2 },
+          { provider: provider3 },
+        ]);
+
+        multiProvider.track('purchase', context, trackingEventDetails);
+
+        expect(provider1.track).toHaveBeenCalledWith('purchase', context, trackingEventDetails);
+        expect(provider2.track).toHaveBeenCalledWith('purchase', context, trackingEventDetails);
+        expect(provider3.track).toHaveBeenCalledWith('purchase', context, trackingEventDetails);
+      });
+
+      it('skips providers without track method', () => {
+        const provider1 = new TestProvider();
+        const provider2 = new InMemoryProvider(); // Doesn't have track method
+        const provider3 = new TestProvider();
+
+        const multiProvider = new MultiProvider([
+          { provider: provider1 },
+          { provider: provider2 },
+          { provider: provider3 },
+        ]);
+
+        expect(() => multiProvider.track('purchase', context, trackingEventDetails)).not.toThrow();
+        expect(provider1.track).toHaveBeenCalledWith('purchase', context, trackingEventDetails);
+        expect(provider3.track).toHaveBeenCalledWith('purchase', context, trackingEventDetails);
+      });
+
+      it('continues tracking with other providers when one throws an error', () => {
+        const provider1 = new TestProvider();
+        const provider2 = new TestProvider();
+        const provider3 = new TestProvider();
+
+        provider2.track.mockImplementation(() => {
+          throw new Error('Tracking failed');
+        });
+
+        const mockLogger = { error: jest.fn(), warn: jest.fn(), info: jest.fn(), debug: jest.fn() };
+        const multiProvider = new MultiProvider(
+          [{ provider: provider1 }, { provider: provider2 }, { provider: provider3 }],
+          undefined,
+          mockLogger,
+        );
+
+        expect(() => multiProvider.track('purchase', context, trackingEventDetails)).not.toThrow();
+
+        expect(provider1.track).toHaveBeenCalledWith('purchase', context, trackingEventDetails);
+        expect(provider2.track).toHaveBeenCalledWith('purchase', context, trackingEventDetails);
+        expect(provider3.track).toHaveBeenCalledWith('purchase', context, trackingEventDetails);
+        expect(mockLogger.error).toHaveBeenCalledWith(
+          'Error tracking event "purchase" with provider "TestProvider-2":',
+          expect.any(Error),
+        );
+      });
+
+      it('respects strategy shouldTrackWithThisProvider decision', () => {
+        const provider1 = new TestProvider();
+        const provider2 = new TestProvider();
+        const provider3 = new TestProvider();
+
+        // Create a custom strategy that only allows the second provider to track
+        class MockStrategy extends FirstMatchStrategy {
+          override shouldTrackWithThisProvider = jest.fn().mockImplementation((strategyContext) => {
+            return strategyContext.providerName === 'TestProvider-2';
+          });
+        }
+
+        const mockStrategy = new MockStrategy();
+
+        const multiProvider = new MultiProvider(
+          [{ provider: provider1 }, { provider: provider2 }, { provider: provider3 }],
+          mockStrategy,
+        );
+
+        multiProvider.track('purchase', context, trackingEventDetails);
+
+        expect(mockStrategy.shouldTrackWithThisProvider).toHaveBeenCalledTimes(3);
+        expect(provider1.track).not.toHaveBeenCalled();
+        expect(provider2.track).toHaveBeenCalledWith('purchase', context, trackingEventDetails);
+        expect(provider3.track).not.toHaveBeenCalled();
+      });
+
+      it('does not track with providers in NOT_READY or FATAL status by default', () => {
+        const provider1 = new TestProvider();
+        const provider2 = new TestProvider();
+        const provider3 = new TestProvider();
+
+        const multiProvider = new MultiProvider([
+          { provider: provider1 },
+          { provider: provider2 },
+          { provider: provider3 },
+        ]);
+
+        // Mock the status tracker to return different statuses
+        const mockStatusTracker = {
+          providerStatus: jest.fn().mockImplementation((name) => {
+            if (name === 'TestProvider-1') return 'NOT_READY';
+            if (name === 'TestProvider-2') return 'READY';
+            if (name === 'TestProvider-3') return 'FATAL';
+            return 'READY'; // Default fallback
+          }),
+        };
+        (multiProvider as any).statusTracker = mockStatusTracker;
+
+        multiProvider.track('purchase', context, trackingEventDetails);
+
+        expect(provider1.track).not.toHaveBeenCalled();
+        expect(provider2.track).toHaveBeenCalledWith('purchase', context, trackingEventDetails);
+        expect(provider3.track).not.toHaveBeenCalled();
+      });
+
+      it('passes correct strategy context to shouldTrackWithThisProvider', () => {
+        const provider1 = new TestProvider();
+        const provider2 = new TestProvider();
+
+        class MockStrategy extends FirstMatchStrategy {
+          override shouldTrackWithThisProvider = jest.fn().mockReturnValue(true);
+        }
+
+        const mockStrategy = new MockStrategy();
+
+        const multiProvider = new MultiProvider([{ provider: provider1 }, { provider: provider2 }], mockStrategy);
+
+        // Mock the status tracker to return READY status
+        const mockStatusTracker = {
+          providerStatus: jest.fn().mockReturnValue('READY'),
+        };
+        (multiProvider as any).statusTracker = mockStatusTracker;
+
+        multiProvider.track('purchase', context, trackingEventDetails);
+
+        expect(mockStrategy.shouldTrackWithThisProvider).toHaveBeenCalledWith(
+          {
+            provider: provider1,
+            providerName: 'TestProvider-1',
+            providerStatus: 'READY',
+          },
+          context,
+          'purchase',
+          trackingEventDetails,
+        );
+
+        expect(mockStrategy.shouldTrackWithThisProvider).toHaveBeenCalledWith(
+          {
+            provider: provider2,
+            providerName: 'TestProvider-2',
+            providerStatus: 'READY',
+          },
+          context,
+          'purchase',
+          trackingEventDetails,
+        );
+      });
+    });
+  });
+});