Task is to draw two communication diagrams :-

Use case: Add course Actor action System response 1. The student enters ID 2. Get student details and show the next two semesters 3. Ask the student to select a semester 5. Retrieves all courses offered in the selected 4. The student selects a semester semester 6. The student chooses one course7. Verify if the student can register this course (see 6a) 8. Check the available place 9. Get prerequisite courses and finds if the student completed those (see 9a) 10.Register the student in this course, and decrement the total available place by one (see 10a) 11.Confirm registration and send SMS to the student 12.The student receives the SMS and sends acknowledgement Alternative flows 6a. If the student is not permitted to take the chosen course, inform the student that she/he cannot register this course 9a. If there is no available place, inform that she/he cannot register. 10a. If the pre requisite course(s) is not complete, inform that he/she cannot register