Chapter 2 – Testing Throughout the SDLC
Observability – ISTQB Definition
Last Updated: July 12, 2026 · SoftwareTestPilot QA Team
Official ISTQB Definition
The ability to understand the internal state of a system based on the external signals it emits, such as logs, metrics and traces.
In simple words
How well you can figure out what a live system is doing from outside.
Exam tip
Observability is the property; monitoring is the practice.
Related terms
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