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. by Dr. Issam Al-Azzoni

Use Case Diagram – 1 (No use of includes/extends) by Dr. Issam Al-Azzoni

Use Case Diagram – 2 (Use of includes/extends) by Dr. Issam Al-Azzoni

Vending machine system A vending machine sells small, packaged, ready to eat items. Each item has a price and a name. A customer can buy an item, using cash or coins to pay for it. The customer presses a letter and then a number from a keypad located under item they wish to purchase. The vending machine checks that at least the appropriate amount of money has been deposited for the item. The vending machine will push the chosen item forward, allowing the item to drop in the tray at the bottom of the machine. The vending machine will subtract the amount of money the item was worth from the amount inserted into the machine and will return this amount through a change slot. The customer puts their hand through the swinging cover of the vending machine tray and takes item. The maintenance employee is responsible for recharging the machine with items when the machine gets low on stock. He also monitors the machine by checking number of items sold, number of items sold per type and total revenue. The administrator sets up the machine by defining items sold and prices for each item.

Vending machine system