Class diagram and sequence diagram

As the head of information systems for a college you are tasked with developing a new student 

registration system. The college would like a new client-server system to replace its much older system 

developed around mainframe technology. The new system will allow students to register for courses 

and view report cards from personal computers attached to the campus LAN. Professors will be able to 

access the system to sign up to teach courses as well as record grades.

Due to a decrease in federal funding, the college cannot afford to replace the entire system at once. The 

college will keep the existing course catalog database where all course information is maintained. This 

database is an Ingres relational database running on a DEC VAX. Fortunately the college has invested in 

an open SQL interface that allows access to this database from college’s Unix servers. The legacy system 

performance is rather poor, so the new system must ensure that access to the data on the legacy system 

occurs in a timely manner. The new system will access course information from the legacy database but 

will not update it. The registrar’s office will continue to maintain course information through another 

system.

At the beginning of each semester, students may request a course catalogue containing a list of course 

offerings for the semester. Information about each course, such as professor, department, and 

prerequisites, will be included to help students make informed decisions.

The new system will allow students to select four course offerings for the coming semester. In addition, 

each student will indicate two alternative choices in case the student cannot be assigned to a primary 

selection. Course offerings will have a maximum of ten students and a minimum of three students. A 

course offering with fewer than three students will be canceled. For each semester, there is a period of 

time that students can change their schedule. Students must be able to access the system during this 

time to add or drop courses. Once the registration process is completed for a student, the registration 

system sends information to the billing system so the student can be billed for the semester. If a course 

fills up during the actual registration process, the student must be notified of the change before 

submitting the schedule for processing.

At the end of the semester, the student will be able to access the system to view an electronic report 

card. Since student grades are sensitive information, the system must employ extra security measures to 

prevent unauthorized access.

Professors must be able to access the on-line system to indicate which courses they will be teaching. 

They will also need to see which students signed up for their course offerings. In addition, the professors 

will be able to record the grades for the students in each class.

Give below are the UML Use Case Diagram and Use Case Specifications (Descriptions). Your task is to 

draw the Sequence and Class Diagram(s).