Chapter 6 – Test Tools
Idempotency – ISTQB Definition
Last Updated: July 12, 2026 · SoftwareTestPilot QA Team
Official ISTQB Definition
The property of an operation that produces the same result whether it is executed once or many times.
In simple words
Doing the same thing twice has the same effect as doing it once.
Exam tip
Test idempotency by replaying the same request and verifying no duplicate side effects — critical for payments and webhooks.
Related terms
Practice this term in the ISTQB Mock Test
40 CTFL v4.0 questions, 60-minute timer, instant scoring and chapter-wise breakdown.
Practice in Mock Test