Functional and non-functional requirements

by Mark Kelly

Functional requirements (FR) = what a solution is required to do, e.g.

• print a receipt with 2 seconds;
• adjust Australian prices to include GST
• produce charts of the data

Consider a FR like a verb.

Non-functional requirements (NFR) of the solution (solution attributes) are qualities such as
user-friendliness, performance levels, e.g. the solution should be

• responsive,
• attractive
• robust,
• portable,
• reliable
• maintainable
• expandable
• etc

Consider a NFR like an adjective

Write to Mark Kelly

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This page was created on 2022-05-04
Last modified on Friday 15 April, 2022 10:03