How to write non-functional requirements
Non-functional requirements are the ones that determine whether a product is usable, reliable, and secure — and they are the ones most often left vague or missing entirely. 'It should be fast' is not a requirement. This guide covers how to write non-functional requirements that engineering can design to.
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What's covered
- 1NFR categories: performance, availability, security, scalability, maintainability, and accessibility — what each covers
- 2Measurable requirement format: how to express each NFR with a metric, a threshold, and a test condition
- 3Worked examples: NFRs written correctly and incorrectly for a form submission feature
- 4Prioritisation guide: how to rank NFRs when you cannot specify everything perfectly
Who this is for
Product managers and BAs who write requirements for development teams and want their non-functional requirements to be actionable, not aspirational.
FREE DOWNLOAD
Get How to write non-functional requirements
Free guide. Build a requirements generation tool in four weeks with the Torvi PM track. Founding rate €200.
Free templates
Guides explain the approach. Templates give you the starting point. Browse the free library.