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Advanced – Non-Functional Testing

Fail Fast – ISTQB Definition

Last Updated: July 12, 2026 · SoftwareTestPilot QA Team

Official ISTQB Definition

A design principle where systems detect and report errors as early as possible rather than continuing in an invalid state.

In simple words

Crash immediately on bad input instead of limping along.

Exam tip

Fail-fast makes bugs visible early — cheaper to fix than silent corruption.

Related terms

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