Sending to the Next Step 

Sometimes, you may not care who sends a job from one process step to the next; in these cases, the last assignee to finish processing the current step is the one who gets to send it to the next one.

Alternatively, when each process step has been completed, you may wish control of the job to pass back to the workflow owner, who can decide whether to push it to a particular assignee or allow it to be pulled by any of the assignees of the next step.

Whether any user or just the owner can send to the next step is based upon the setting of the Send Next Step property of the Start step.