Advanced – Non-Functional Testing
Error Budget – ISTQB Definition
Last Updated: July 12, 2026 · SoftwareTestPilot QA Team
Official ISTQB Definition
The maximum amount of time a service can fail to meet its SLO before action is required.
In simple words
How much unreliability you're allowed before you must slow down releases.
Exam tip
Once the budget is burned, focus shifts from features to reliability work.
Related terms
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