Chapter 1 – Fundamentals of Testing
Test Oracle – ISTQB Definition
Last Updated: July 12, 2026 · SoftwareTestPilot QA Team
Official ISTQB Definition
A source used to determine expected results to compare with the actual result of the software under test.
In simple words
Whatever tells you what the ‘right’ answer should be — a requirement, a spec, a previous version, or even an experienced user.
Exam tip
The oracle problem — not always having a reliable oracle — is why experience-based testing is often needed.
Related terms
- Test CaseA single, executable check with a clear setup, action, and expected outcome — the atomic unit of testing.
- VerificationAre we building the product right? — checking that the work product matches its specification.
- ValidationAre we building the right product? — checking that the system actually meets user needs and intended use.
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