Chapter 6 – Test Tools
Test Isolation – ISTQB Definition
Last Updated: July 12, 2026 · SoftwareTestPilot QA Team
Official ISTQB Definition
The principle that each test should run independently without depending on the order, state, or side effects of other tests.
In simple words
Each test stands on its own — no leftover data or order dependency.
Exam tip
Poor isolation is the #1 root cause of flakiness in E2E suites.
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