CS 160: Software Engineering
Sections 1 and 2
Spring Semester 2008
Department of Computer Science
San Jose State University
Instructor: Prof. Ron Mak
Assignment: Use cases
|
Assigned: |
Tuesday, January 29 |
|
Due: |
Tuesday, February 5 |
|
|
100 points |
Supermarket checkout station
A modern supermarket
checkout station is a computerized system. A checkout clerk must log in when
coming on duty and later log out when going off duty.
When a customer
arrives, the clerk uses the system’s scanner to read the barcode on each item
the customer wishes to purchase. The system queries the product database to
determine what the item is and its price, displays the price, and adds the
price to the customer’s running total. If for some reason the scanner cannot
read a barcode or the item isn’t in the product database, then the clerk must
enter the price manually.
The customer chooses
how pay using a keypad: by cash or by bank debit card. If paying by cash, the
customer hands money to the clerk, who then must make change if necessary. If
paying by debit card, the customer swipes the card at the keypad and enters the
PIN. The checkout station contacts the customer’s bank for verification. If the
customer specifies at the keypad that he or she wants cash back and enters the
amount, the clerk must provide that amount in cash. In either case, after
paying, the customer leaves with the purchases.
Assignment
You may use this Word
form for the written descriptions: view it and download it.
|
Useful references: |
|
|
|
http://alistair.cockburn.us/index.php/Use_cases,_ten_years_later |
|
|
http://alistair.cockburn.us/index.php/Basic_use_case_template |