For the person who owns a process. This page says what SmartApps put in your hands, what stays with other roles, and how a week runs.
A criterion is yours: edit it in the expression editor, test it on live rows, publish a version. IT keeps the gates for new connectors, new write-backs and promotion.
Preview runs it as each role on live rows with writes held; publish when the preview matches the process.
Update the hierarchy; running instances finish on the version they started on, new ones use the new hierarchy.
Tell us your role and one process; the demonstration runs the screens you would use, on data like yours.