Chapter 5 – Test Management
Defect Arrival Rate – ISTQB Definition
Last Updated: July 12, 2026 · SoftwareTestPilot QA Team
Official ISTQB Definition
The number of new defects reported per unit time during a test period.
In simple words
How many new bugs are being logged per day / sprint / build.
Exam tip
A falling arrival rate near release is a positive maturity signal.
Related terms
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