Task is to draw two communication diagrams :-

Use case: Drop course Actor action The student enters ID The student selects a course System response 1. 3. 2. 4. 5. Retrieve all courses registered Check deadline Ask the student to confirm the deletion (see 5a Deletes the course, and increment the total available places of the course by one (see 7a Inform the student about the outcome of the deletion request. 6. The student confirms or declines 7. 8 9. Alternative flows 5a. If the deadline has already passed, inform that the course cannot be deleted 7a. If the student declines to confirm the deletion, ends the session without any deletion. Use case: Compute GPA Actor action System response 1. The student enters ID and semester 2. Retrieve results of all courses taken in the semester 3. Compute and display GPA 4. Ask if the student wants to print 6. Print the results with GPA (6a 7. Update the total number of GPA calculation for 5. The student selects the option this semester Alternative flows 6a. If the student does not want to print, save only GPA