Advanced – Non-Functional Testing
Quality Model – ISTQB Definition
Last Updated: July 12, 2026 · SoftwareTestPilot QA Team
Official ISTQB Definition
A defined set of characteristics, and of relationships between them, which provides a framework for specifying quality requirements and evaluating quality.
In simple words
A structured checklist of what 'quality' means, so requirements and tests can target it.
Exam tip
ISO 25010 is the most commonly used quality model in ISTQB.
Related terms
- ISO/IEC 25010The reference model with 8 product quality characteristics and 5 quality-in-use characteristics.
- QualityTwo lenses: does it match the spec, and does it delight the user? Both matter.
- Non-Functional TestingHow fast, how secure, how usable, how reliable — the ‘qualities’ around the feature, not the feature itself.
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