question about CLASS

if there is a problem in which there are 3 entities :

STUDENT (who adds a course, change and withdraw) ,
STAFF ( who help student add, change ,withdraw) and
FACULTY ( who advises student on the courses to choose etc)

there are total THREE Classes right? i just want to make sure if im right or not.

thanx

Yea these three are classes .....

You might want to make a base class and derive two or all of the classes, since they all seem to work with courses. Courses could be a base class as well, with derived classes programming, english, math, etc.