Components Security Unicode Usability Web arch. This information is modified from Chapter 3 of Ambler's The Object Primer 2nd Edition . An actor represents anything or anyone that interfaces with your system.
Actors are always external to the system being modeled.
They are never part of the system. Yes, it is quite likely that students are people. However, consider Registrar . Today, at most modern universities there are people in the role of registrar. Consider what registrars do.