diff --git a/workflow/workflow_abc.py b/workflow/workflow_abc.py
index 6bcb39e..2a3db46 100644
--- a/workflow/workflow_abc.py
+++ b/workflow/workflow_abc.py
@@ -38,30 +38,17 @@ class LaunchParameters:
     # The RunningWorkflowStep UUID.
     # Required if the Instance is part of a Workflow step.
     running_workflow_step_id: str | None = None
-    # A map of prior workflow steps and files to copy (link) into the step.
-    # Used by the Workflow Engine when the instance to be launched depends on the
-    # execution of a prior instance (or instances). The map is indexed by prior workflow
-    # step ID and is a list of tuples that consist of two values - a prior workflow
-    # (instance-relative) file name, and the name of that file when copied (linked)
-    # into the step to be executed.
+    # A list of prior workflow steps that this step depends upon.
     #
-    # This map gives the InstanceLauncher an opportunity to take the outputs
+    # This list gives the InstanceLauncher an opportunity to take the outputs
     # of a prior instance and link them to the instance directory for the
     # instance to be launched. We need to do this for Workflows because Instances
     # run as apart of a Workflow do not automatically have their outputs copied (linked)
     # to the Project directory when they complete. As an example, a step that relies
-    # on the output files 'x.sdf' and 'y.sdf' from step 'a04d', and expects them to be
-    # called 'a.sdf' and 'b.sdf' in its own instance directory
-    # will provide the following map: -
+    # on the output files from two prior steps will provide the following list: -
     #
-    #   {"r-workflow-step-a04d": [("x.sdf", "a.sdf"), ("y.sdf", "b.sdf")]}
-    #
-    # Each source file must be linked to a unique destination file -
-    # you cannot map the input examples shown above ()'x.sdf' and 'y.sdf') to the
-    # same file (i.e. 'a.sdf').
-    running_workflow_step_prior_step_output_map: (
-        dict[str, list[tuple[str, str]]] | None
-    ) = None
+    #   ["r-workflow-step-a04d", "r-workflow-step-d904"]
+    running_workflow_step_prior_steps: list[str] | None = None
     # Workflow inputs (for this step Instance). These Workflow Inputs (files) are
     # expected to be present in the Project directory. It is simply a list of files
     # with the ability to rename them. For example, if the step requires "a.sdf"