Use case:
7 tasks are assigned to 7 different suppliers ( number 7 just mentioned as an example). Once a task has been completed it has to be reviewed for completion. If review indicates more information is needed, then notification should only go to the supplier whose information is incomplete.
Review can happen as and when suppliers complete their task; meaning that review need not be only after all tasks are completed. It can happen even if 1 out of 7 has completed the task.
A script task needs to be executed after all 7 suppliers have completed their tasks.