Check Out A CUSTOMER can order books to purchase. The CUSTOMER clicks the Check out button on the Web Page. Actor/s: CUSTOMER Pre-condition: The user have logged in and has at least one book in the Shopping Cart. A CUSTOMER can purchase the books in his/her Shopping Cart.Post-condition: The CUSTOMER is not authorised to perform transactions. CUSTOMER is not an authorised user the system displays a pop-up message to inform the CUSTOMER. The system validates the log-in information against the ACCOUNT table in the database. The CUSTOMER enters his/her user ID and password. The CUSTOMER clicks the Log-in button on the Home Page. CUSTOMER is an authorised user the system displays the Personal Home Page to the CUSTOMER Post-condition: The CUSTOMER has been authorised to perform transactions. The ACCOUNT and CUSTOMER tables are updated. Post-condition: The new CUSTOMER has registered. If yes, the system update the CUSTOMER’s record in the CUSTOMER and ACCOUNT tables in the database. The system checks that all of the required information were entered. The CUSTOMER enters all of the required information. The CUSTOMER clicks the REGISTER button on the Home Page.

Actor/s: CUSTOMER Pre-condition: An unregistered CUSTOMER. Log-in A new CUSTOMER needs to first register into the system before performing any transaction. A CUSTOMER needs to log-in before performing any transaction Actor/s: CUSTOMER Pre-condition: A registered user.Register Order books Sell used books Review books Customer On-line Bookstore System Log-in > Check out > (CustID) Use Case Context Diagram.Post-condition: The CUSTOMER has been authorised to perform transactions. Customer Use Case Description: A CUSTOMER needs to log-in before performing any transaction Pre-condition: A registered user.Auction Website Use Cases Auction Website Search for item Place bid Put item up for auction Register account Customer.Use Case Diagrams A Detailed Description.

Online use case diagram