SE-565

Software Systems Requirements

Homework Assignment 3 (Due Tuesday, Nov. 27)

    Consider a simple auto-teller machine (ATM). The machine accepts customer requests and
dispenses cash, display and prints out mini statements, and provides the bank manager with a daily transaction report. User interacts with the ATM through a display unit and a keypad. An ATM user must have a valid ATM card and PIN before he or she can access the services of the ATM. Cash withdraws must be less than or equal to the user's balance. Apart from providing services to its users, the ATM is also required to update the customer account databases each time there is a cash withdrawal. The banker manager uses a staff PIN to access the system for transaction reports.

1. Construct a two-level data-flow diagram of the ATM showing the services that are provided.

2. Identify possible objects and construct a class diagram.

3. Draw sequence diagrams for the following two use cases:
    a. A user withdraws cash.
    b. A bank manager prints a daily transaction report.