Transcript Use case tutorial

Use case tutorial
examples
Example 1
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Question2: Online registration system
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King AbdulAziz University established a new online registration system for external students .
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.
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The new on-line registration system will allow students to select four course offerings for the
coming semester. In addition, each student will indicate two alternative choices in case a
course offering becomes filled or canceled. No course offering will have more than ten
students. No course offering will have fewer than three students.
A course offering with fewer than three students will be canceled. 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.
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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 offering.
For each semester, there is a period of time that students can change their schedules.
Students must be able to access the on-line system during this time to add or drop courses.
The billing system will credit all students for courses dropped during this period of time.
Example 1(cont..)
• You are required to
• Maintain Use-case Diagram.
• Write the use-case description using the
expanded format (with typical course of
events and alternatives sections) for manage
schedule use-case, create schedule, add
course, delete course.
Use case diagram
professor
View
Students
View Course
Manage
schedule
student
<<extend>>
Add course
<<extend>>
<<extend>>
Create
course
Delete
course
<<Include>>
< <Include>>
View
catalogue
Receive
information
biling system
Manage schedule Use case
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Manage schedule
Name: manage schedule.
Actor: student, billing system.
Description: The use case begins when the student wants
to create schedule for the next semester or update his
current schedule.
• Type: primary, essential.
• Cross reference: add, delete and create.
• Precondition: the student has an account in the system.
Expanded use case (cont..)
• Typical course of event
Actor Action
System response
1. This use case begins when the
student enters the student id
number.
2.The system verifies that the student id number is
valid
3. Prompts the student to select the semester #.
4. The student enters the desired
semester.
5. display choices
6. The student selects to the
desired operation
7. The student indicates that the
activity is complete…
8. The system will print the student schedule and
notify the student that registration is complete.
9. The system sends billing information for the student
to the billing system for processing.
Expanded use case (cont..)
• Alternatives
• Alternative at 2: If an invalid id number is entered, the
system will not allow access to the registration system.
• Alternative at 5:
• If the student select current semester, system will display
(update schedule).
• If student select next semester, system will display (create).
• Alternative at 6
• Extension point: If student select create, go to create usecase.
• Extension point: If student select add, go to add use-case
• Extension point :If student select drop, go to drop use-case
Create Use case
Actor Action
System response
1. the student view available course using
view catalog use-case
2. The student enters 4 primary course
offering numbers and 2 alternate course
offering numbers.
3. The student then submits the request for 4. Checks those prerequisites are satisfied
courses
for the requested course.
5. Adds the student to the course
offering if the course offering is open.
• Alternative at 5: If a primary course offering is not available, the system
will substitute an alternate course offering.
Add course Use case
Actor Action
System response
1. the student view available course
using view catalog use-case
2. The student indicates which course
offerings to add.
3. The system checks that the final date
for changes has not been exceeded.
4. The system then:
Verifies that the maximum course load
for the student has not been exceeded.
Checks that prerequisites are satisfied for
the requested course.
Adds the student to the course offering if
the course offering is open
Alternative at 4: if the system can't add the course for any reasons, then it will
display a message to indicate that.
Delete course
Actor Action
System response
1. The student indicates which course
offerings to delete.
2. The system checks that the final date
for changes has not been exceeded.
3. The system deletes the student from
the course offering.
4.The system notifies the student that the
request has been processed
Alternative at 3: if minimum course load for the student was exceeded due to the
delete, then drop operation will stop.
Use case-example
• The Indian railways wish to develop a ticketing and reservation
system. This must support advance booking of tickets and change of
class of a ticket. All this is handled by the reservation clerk.
The system will also have a web interface where the users can
register themselves and purchase tickets online. They can pay
either by using their online banking account or by credit cards or by
VPP. Reservations made over the internet can be canceled across
the counter. The users can also print the tickets.
The seats are updated when ever the reservation is made or
canceled . In case of payment failure a notification is generated by
the system
The system will also have querying facility that allows users to
check train timetables, fares and availability of tickets.
Use cases
Cancel
reservation
Print ticket
Make
Reservation
Register as
member
Modify
Class
Check fare
Make
Payment
Query
timetable
HW
• You are required to
Maintain Use-case Diagram.
Write the use-case description using the expanded format (with typical course
of events and alternatives sections) for make reservation;