The Prepare phase includes everything that has to happen before your visitor is approved to sign in.
The work done during the Prepare phase reduces the unnecessary steps on arrival and keeps visitors moving while their host is notified.
The Engage phase is when visitors or employees are present — virtually or physically — from the moment they sign in to the end of their visit.
Depart phase covers the end of an engagement, whether the person is signing out at the end of a visit, or the conclusion of their working day.
The Review phase is all about retrospection and continuous improvement of your processes.