WorldServer supports reuse of workflows in an even more advanced mode by allowing for parallel execution of multiple sub-workflows. Much like the Parallel Review Step, the workflow splits and waits for all the sub-workflows to complete. Like the Sub-Workflow Step, the Parallel Sub-Workflow Step has a result of Success or Failure.

In a Parallel Sub-Workflow Step, the Success or Failure result is determined by looking at the individual results of each of the sub-workflows and returning an aggregate result based on one of two possible choices:

• And – The result of an And Parallel Sub-Workflow step is Success if all of the sub-workflows return Success. It is Failure if one or more sub-workflows return Failure.
• Or – The result of an Or Parallel Sub-Workflow step is Success if any of the sub-workflows return Success. It returns Failure only if all of the sub-workflows return Failure.

For each parallel sub-workflow step, choose how many parallel branches the step includes, whether the step returns results based on and results or or results, and specify another existing workflow to embed for each branch of the parallel sub-workflow step.