Chapter 5 – Test Management
Production Defect – ISTQB Definition
Last Updated: July 12, 2026 · SoftwareTestPilot QA Team
Official ISTQB Definition
A defect that is reported by end users or discovered in the production environment.
In simple words
A bug found in live use — usually the most expensive kind.
Exam tip
Every production defect deserves a 'why didn't we catch it' review.
Related terms
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