diff --git a/src/it/lints-it/src/test/java/org/eolang/lints/it/LintsItTest.java b/src/it/lints-it/src/test/java/org/eolang/lints/it/LintsItTest.java
index c4e99d19a..c816af1ae 100644
--- a/src/it/lints-it/src/test/java/org/eolang/lints/it/LintsItTest.java
+++ b/src/it/lints-it/src/test/java/org/eolang/lints/it/LintsItTest.java
@@ -22,7 +22,7 @@ final class LintsItTest {
     void lintsProgram() throws IOException {
         MatcherAssert.assertThat(
             "passes with no exceptions",
-            new Program(new XMLDocument("<program name='it'/>")).defects(),
+            new Project(new XMLDocument("<program name='it'/>")).singleDefects(),
             Matchers.notNullValue()
         );
     }
diff --git a/src/main/java/org/eolang/lints/Program.java b/src/main/java/org/eolang/lints/Program.java
index 9f52b678c..8aaee2f99 100644
--- a/src/main/java/org/eolang/lints/Program.java
+++ b/src/main/java/org/eolang/lints/Program.java
@@ -22,7 +22,7 @@
  * @see <a href="https://news.eolang.org/2022-11-25-xmir-guide.html">XMIR</a>
  * @since 0.1.0
  */
-public final class Program {
+final class Program {
 
     /**
      * Collection of mono lints, preloaded on JVM start.
@@ -48,7 +48,7 @@ public final class Program {
      * @param file The absolute path of the XMIR file
      * @throws FileNotFoundException If file isn't found
      */
-    public Program(final Path file) throws FileNotFoundException {
+    Program(final Path file) throws FileNotFoundException {
         this(new XMLDocument(file));
     }
 
@@ -56,7 +56,7 @@ public Program(final Path file) throws FileNotFoundException {
      * Ctor.
      * @param xml The XMIR
      */
-    public Program(final XML xml) {
+    Program(final XML xml) {
         this(xml, Program.MONO);
     }
 
diff --git a/src/main/java/org/eolang/lints/Programs.java b/src/main/java/org/eolang/lints/Programs.java
index 46a096212..c2bfd3183 100644
--- a/src/main/java/org/eolang/lints/Programs.java
+++ b/src/main/java/org/eolang/lints/Programs.java
@@ -37,7 +37,7 @@
  * @see <a href="https://news.eolang.org/2022-11-25-xmir-guide.html">XMIR</a>
  * @since 0.1.0
  */
-public final class Programs {
+final class Programs {
 
     /**
      * Collection of mono lints, preloaded on JVM start.
@@ -65,7 +65,7 @@ public final class Programs {
      * @param dirs The directory
      * @throws IOException If fails
      */
-    public Programs(final Path... dirs) throws IOException {
+    Programs(final Path... dirs) throws IOException {
         this(Arrays.asList(dirs));
     }
 
@@ -78,7 +78,7 @@ public Programs(final Path... dirs) throws IOException {
      * @param dirs The directory
      * @throws IOException If fails
      */
-    public Programs(final Collection<Path> dirs) throws IOException {
+    Programs(final Collection<Path> dirs) throws IOException {
         this(Programs.discover(dirs));
     }
 
@@ -86,7 +86,7 @@ public Programs(final Collection<Path> dirs) throws IOException {
      * Ctor.
      * @param map The map with them
      */
-    public Programs(final Map<String, XML> map) {
+    Programs(final Map<String, XML> map) {
         this(map, Programs.WPA);
     }
 
diff --git a/src/main/java/org/eolang/lints/Project.java b/src/main/java/org/eolang/lints/Project.java
new file mode 100644
index 000000000..d139e8ab0
--- /dev/null
+++ b/src/main/java/org/eolang/lints/Project.java
@@ -0,0 +1,27 @@
+/*
+ * SPDX-FileCopyrightText: Copyright (c) 2016-2025 Objectionary.com
+ * SPDX-License-Identifier: MIT
+ */
+package org.eolang.lints;
+
+import java.util.Collection;
+
+/**
+ * Project, files of which can be analyzed separately or together.
+ *
+ * @since 0.0.9
+ */
+public interface Project {
+
+    /**
+     * Defects found by analyzing each file independently.
+     * @return Collection of defects from all files
+     */
+    Collection<Defect> singleDefects();
+
+    /**
+     * Defects found by analyzing all files together.
+     * @return Collection of defects from all files
+     */
+    Collection<Defect> wpaDefects();
+}
diff --git a/src/main/java/org/eolang/lints/ProjectOf.java b/src/main/java/org/eolang/lints/ProjectOf.java
new file mode 100644
index 000000000..2d6a95446
--- /dev/null
+++ b/src/main/java/org/eolang/lints/ProjectOf.java
@@ -0,0 +1,123 @@
+/*
+ * SPDX-FileCopyrightText: Copyright (c) 2016-2025 Objectionary.com
+ * SPDX-License-Identifier: MIT
+ */
+package org.eolang.lints;
+
+import com.jcabi.xml.XML;
+import java.io.IOException;
+import java.nio.file.Path;
+import java.util.Collection;
+import java.util.List;
+import java.util.Map;
+import org.cactoos.func.Chained;
+import org.cactoos.iterable.Mapped;
+import org.cactoos.list.Joined;
+import org.cactoos.list.ListOf;
+
+/**
+ * Implementation of Project. Provides several ways to make Project object.
+ *
+ * @since 0.0.9
+ */
+public final class ProjectOf implements Project {
+
+    /**
+     * Collection of programs that should be analyzed independently.
+     */
+    private final Iterable<Program> programs;
+
+    /**
+     * Programs that should be analyzed together.
+     */
+    private final Programs wpa;
+
+    /**
+     * Ctor.
+     * @param xml XML source.
+     */
+    public ProjectOf(final XML xml) {
+        this(xml, "single");
+    }
+
+    /**
+     * Ctor.
+     * @param xml XML source.
+     * @param name File name.
+     */
+    public ProjectOf(final XML xml, final String name) {
+        this(
+            new Program(xml),
+            new Programs(Map.of(name, xml))
+        );
+    }
+
+    /**
+     * Ctor.
+     * @param home Path to file.
+     * @throws IOException Throw IOException in case of problems working with files.
+     */
+    public ProjectOf(final Path home) throws IOException {
+        this(
+            new Program(home),
+            new Programs(home)
+        );
+    }
+
+    /**
+     * Ctor.
+     * @param programs Set of programs XMLs with names.
+     * @param list List of lints for independent analyze.
+     * @param wpa List of lints for full project analyze.
+     */
+    public ProjectOf(
+        final Map<String, XML> programs,
+        final Iterable<Lint<XML>> list,
+        final Iterable<Lint<Map<String, XML>>> wpa
+    ) {
+        this(
+            new Mapped<>(
+                xml -> new Program(xml, list),
+                programs.values()
+            ),
+            new Programs(programs, wpa)
+        );
+    }
+
+    /**
+     * Ctor.
+     * @param program Single program.
+     * @param wpa Programs for whole program analysis.
+     */
+    ProjectOf(final Program program, final Programs wpa) {
+        this(
+            new ListOf<>(program),
+            wpa
+        );
+    }
+
+    /**
+     * Ctor.
+     * @param programs List of single programs.
+     * @param wpa Programs for whole program analysis.
+     */
+    ProjectOf(final Iterable<Program> programs, final Programs wpa) {
+        this.programs = programs;
+        this.wpa = wpa;
+    }
+
+    @Override
+    public Collection<Defect> singleDefects() {
+        return new Joined<>(
+            new Mapped<List<Defect>>(
+                new Chained<>(Program::defects, ListOf::new),
+                this.programs
+            )
+        );
+    }
+
+    @Override
+    public Collection<Defect> wpaDefects() {
+        return this.wpa.defects();
+    }
+}
diff --git a/src/test/java/benchmarks/ProgramBench.java b/src/test/java/benchmarks/ProgramBench.java
index d5ee6ad81..65de7a63e 100644
--- a/src/test/java/benchmarks/ProgramBench.java
+++ b/src/test/java/benchmarks/ProgramBench.java
@@ -9,7 +9,8 @@
 import fixtures.LargeXmir;
 import java.util.concurrent.TimeUnit;
 import org.cactoos.scalar.Unchecked;
-import org.eolang.lints.Program;
+import org.eolang.lints.Project;
+import org.eolang.lints.ProjectOf;
 import org.openjdk.jmh.annotations.Benchmark;
 import org.openjdk.jmh.annotations.BenchmarkMode;
 import org.openjdk.jmh.annotations.Fork;
@@ -21,7 +22,7 @@
 import org.openjdk.jmh.annotations.Warmup;
 
 /**
- * Benchmark for {@link Program}.
+ * Benchmark for {@link Project}::singleDefects.
  *
  * @since 0.0.34
  * @checkstyle DesignForExtensionCheck (10 lines)
@@ -47,11 +48,11 @@ public class ProgramBench {
 
     @Benchmark
     public final void scansLargeXmir() {
-        new Program(ProgramBench.LARGE).defects();
+        new ProjectOf(ProgramBench.LARGE).singleDefects();
     }
 
     @Benchmark
     public final void scansSmallXmir() {
-        new Program(ProgramBench.SMALL).defects();
+        new ProjectOf(ProgramBench.SMALL).singleDefects();
     }
 }
diff --git a/src/test/java/benchmarks/ProgramsBench.java b/src/test/java/benchmarks/ProgramsBench.java
index e76cb7bc2..521cc588d 100644
--- a/src/test/java/benchmarks/ProgramsBench.java
+++ b/src/test/java/benchmarks/ProgramsBench.java
@@ -11,8 +11,8 @@
 import java.nio.file.Path;
 import java.util.concurrent.TimeUnit;
 import org.cactoos.scalar.IoChecked;
-import org.eolang.lints.Program;
-import org.eolang.lints.Programs;
+import org.eolang.lints.Project;
+import org.eolang.lints.ProjectOf;
 import org.openjdk.jmh.annotations.Benchmark;
 import org.openjdk.jmh.annotations.BenchmarkMode;
 import org.openjdk.jmh.annotations.Fork;
@@ -24,7 +24,7 @@
 import org.openjdk.jmh.annotations.Warmup;
 
 /**
- * Benchmark for {@link Program}.
+ * Benchmark for {@link Project}::wpaDefects.
  *
  * @since 0.0.34
  * @checkstyle DesignForExtensionCheck (10 lines)
@@ -62,6 +62,6 @@ public ProgramsBench() {
 
     @Benchmark
     public final void scansLargeProgram() throws IOException {
-        new Programs(this.home).defects();
+        new ProjectOf(this.home).wpaDefects();
     }
 }