Use Case Modeling Example By: Dr. Issam Al-Azzoni.

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Presentation transcript:

Use Case Modeling Example By: Dr. Issam Al-Azzoni

Online Car Rental System A customer can browse available cars. A customer can create a new car reservation. The system validates credit card information by communicating with an online credit card validator system. A clerk can view and print car reservations.

Use Case Diagram – 1 (No use of includes/extends)

Use Case Description 1 Create a New Reservation Primary Actor: Customer Secondary Actor: Online Visa Card Validator System Pre-conditions: Customer is on the main page. Basic Flow: 1.Customer selects the “Create a New Reservation” option. 2.System requests reservation information [pickup location, pickup date, return date, pickup time, return time, and vehicle]. 3.Customer submits reservation information. 4.System requests customer information [first name, last name, address, driver’s license number, credit card number and date] 5.Customer submits his/her information. 6.System sends credit card information [first name, last name, credit card number and date] to Online Visa Card Validator System. 7.Online Visa Card Validator System validates credit card information. 8.Online Visa Card Validator System sends a message acknowledging credit card validation to System. 9.System displays a message confirming the new reservation and showing the reservation details. 10.System sends an message to Customer’s address confirming the new reservation and showing the reservation details. Post-conditions: If the basic flow was successful, a new reservation is created. Otherwise, the system state is unchanged.

Use Case Diagram – 2 (Use of includes/extends)

Use Case Description 2 Create a New Reservation Primary Actor: Customer Secondary Actor: Online Visa Card Validator System Pre-conditions: Customer is on the main page. Basic Flow: 1.Customer selects the “Create a New Reservation” option. 2.System requests reservation information [pickup location, pickup date, return date, pickup time, return time, and vehicle]. 3.Customer submits reservation information. 4.System requests customer information [first name, last name, address, driver’s license number, credit card number and date] 5.Customer submits his/her information. 6.Execute the ‘Validate Credit Card Information’ use case. 7.System displays a message confirming the new reservation and showing the reservation details. 8.System sends an message to Customer’s address confirming the new reservation and showing the reservation details. Post-conditions: If the basic flow was successful, a new reservation is created. Otherwise, the system state is unchanged.

Alternative Flows – UCD 1 In Step 7, credit card information is not valid: Online Visa Card Validator System sends an error message to System. System displays the error message to Customer. Repeat from Step 4. In Step 3, necessary reservation information is missing: System displays an error message requesting the missing information. Repeat from Step 2. In Steps 3 and 5, a timeout occurs: System displays a ‘timeout’ error message. Customer is returned to the main page.