You can identify all of the task instances that originate from a single Human task and complete the task instances in a single operation.
When all of the task instances for a Human task are complete, the records in the tasks move to the next stage in the workflow. The Analyst tool removes the tasks from the users who worked on the tasks. You do not update any record data or status data when you complete the tasks.
You might decide to complete the tasks in the following cases:
The workflow failed, and you want to run the workflow again.
The users cannot finish the task instances on time.