a) Draw a UML use case diagram that lists all the major use cases.

b) Create a sequence diagram for one of the use cases obtained above.

c) Create a class diagram for the system.

5. The Registrar sets up the curriculum for a semester
6. Students select 3 ~ 5 courses
7. Once a student registers for a semester, the billing system is notified so the student may be billed for the semester
8. Once a student registers for a semester, the registrar is notified as well for records
9. Students may use the system to add/drop courses for a period of time after registration
10. A class cannot exceed 20 students
    • Otherwise, the class is closed
11. Professors use the system to set their preferred course offerings and receive their course offering rosters after students register
    • The teaching load is that a professor teaches 2 ~ 4 courses a semester
    • One course may have several offerings, i.e., a course may be offered in several sessions