Advanced – Non-Functional Testing
Testability – ISTQB Definition
Last Updated: July 12, 2026 · SoftwareTestPilot QA Team
Official ISTQB Definition
The degree of effectiveness and efficiency with which test criteria can be established for a system and tests can be performed.
In simple words
How easy it is to write good tests for the software.
Exam tip
Poor testability is a design smell — push feedback back to developers.
Related terms
- MaintainabilityHow easily developers can change, fix or extend the software later.
- Shift-Left TestingStart testing — reviews, unit tests, static analysis — as early as possible, not at the end.
- ISO/IEC 25010The reference model with 8 product quality characteristics and 5 quality-in-use characteristics.
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