Agile Tester Extension
INVEST – ISTQB Definition
Last Updated: July 12, 2026 · SoftwareTestPilot QA Team
Official ISTQB Definition
A checklist for good user stories: Independent, Negotiable, Valuable, Estimable, Small, Testable.
In simple words
The six-letter test for a good user story: Independent, Negotiable, Valuable, Estimable, Small, Testable.
Exam tip
The T (Testable) is the tester's leverage point — no acceptance criteria, no story.
Related terms
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