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ISTQB Certified Tester Foundation Level: Agile Tester (CTFL-AT) · ISTQB
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Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.
- Shift-left testing principle: defects in requirements and acceptance criteria are far cheaper to fix when detected during specification than after coding or release. Testers participating in criteria writing identify ambiguity, missing scenarios, and testability issues early.