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User Requirements for ATM Cash Dispensing

publish date: 2026/06/06 23:08:29.654635 UTC

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Consider writing user requirements for the cash-dispensing function in a bank ATM. Which of the following are appropriate user-level requirements? Select all that apply.

A user shall be able to request a printed receipt showing the transaction amount and remaining balance.

A user shall be informed if their requested withdrawal amount exceeds their available balance.

The ATM shall implement SHA-256 hashing for PIN verification.

A user shall be able to select from a menu of standard withdrawal amounts.

The ATM database shall use a B-tree index for fast account lookups.

A user shall be able to withdraw cash in multiples of the denominations available in the machine.

Correct Answer

(1) A user shall be able to withdraw cash in multiples of the denominations available in the machine.

(2) A user shall be informed if their requested withdrawal amount exceeds their available balance.

(3) A user shall be able to select from a menu of standard withdrawal amounts.

(4) A user shall be able to request a printed receipt showing the transaction amount and remaining balance.

Explanation

User requirements describe external, user-observable behaviors without implementation details. Denominations, balance notification, standard amounts menu, and receipts are all user-visible behaviors. SHA-256 hashing and B-tree indexes are implementation details — system-level requirements inappropriate for user requirements.

Reference

Software Engineering, Ian Sommerville, 9th edition

Quizzes you can take where this question appears

Applied Requirements Engineering - Exercises