Each student can Enroll one or more subjects.Each subject must belong to a program
of a department.Each student must have an advisor who work in a
department that belongs to s faculty.Any advisor who advises student
may be a lecturer,an assistant professor an associated professor or a profesor
who is an academic staff.Each subject can relate whit other subject.
Each faculty can consists of many departments.Each depaerment can
consists of many programs.