Advanced – Non-Functional Testing
Modifiability – ISTQB Definition
Last Updated: July 12, 2026 · SoftwareTestPilot QA Team
Official ISTQB Definition
The degree to which a product can be effectively modified without introducing defects or degrading quality.
In simple words
How safely you can change the code without breaking other things.
Exam tip
A maintainability sub-characteristic in ISO 25010.
Related terms
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