Chapter 1 – Fundamentals of Testing
Seven Testing Principles – ISTQB Definition
Last Updated: July 12, 2026 · SoftwareTestPilot QA Team
Official ISTQB Definition
A set of principles offering general guidelines common for all testing: testing shows the presence of defects not their absence; exhaustive testing is impossible; early testing saves time and money; defects cluster together; tests wear out; testing is context dependent; and absence-of-errors is a fallacy.
In simple words
Seven quick truths every tester should internalize — from ‘you can’t test everything’ to ‘no bugs found doesn’t mean the product is good enough’.
Exam tip
Expect at least one CTFL exam question asking you to identify which listed statement is one of the seven principles.
Related terms
- Defect ClusteringBugs are not spread evenly — a few risky modules host most of them, so focus extra testing there.
- Pesticide ParadoxRunning the same tests forever stops catching new bugs. You need to review and refresh test cases regularly.
- Test OracleWhatever tells you what the ‘right’ answer should be — a requirement, a spec, a previous version, or even an experienced user.
Practice this term in the ISTQB Mock Test
40 CTFL v4.0 questions, 60-minute timer, instant scoring and chapter-wise breakdown.
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