Advanced – Non-Functional Testing
Usability – ISTQB Definition
Last Updated: July 12, 2026 · SoftwareTestPilot QA Team
Official ISTQB Definition
The degree to which a product can be used by specified users to achieve specified goals with effectiveness, efficiency and satisfaction (ISO/IEC 25010).
In simple words
How easy and pleasant the software is to use for its intended users.
Exam tip
Usability is broader than UI — it includes learnability, operability, accessibility.
Related terms
- Usability TestingWatch real users try the product to see if the UI actually works for them.
- Accessibility TestingCheck the software works for users with visual, motor or cognitive disabilities.
- ISO/IEC 25010The reference model with 8 product quality characteristics and 5 quality-in-use characteristics.
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