Advanced – Non-Functional Testing
Modularity – ISTQB Definition
Last Updated: July 12, 2026 · SoftwareTestPilot QA Team
Official ISTQB Definition
The degree to which a system is composed of discrete components such that a change to one component has minimal impact on other components.
In simple words
Well-separated pieces that don't cause ripple effects when changed.
Exam tip
Sub-characteristic of Maintainability.
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