Maintainability
Maintainability is the degree to which a software product can be modified efficiently to correct defects, improve performance, or adapt to changing requirements.
“The degree to which a component or system can be modified by the intended maintainers.”
(Definition reproduced from the ISTQB Glossary. Copyright belongs to ISTQB.)
View the complete ISTQB GlossaryWhat is Maintainability?
Maintainable software is easier to understand, update, test, and extend throughout its lifecycle, reducing long-term development costs.
Ease of modification: Code changes should require minimal effort.
Code quality: Good design and documentation improve maintainability.
Testing value: Maintainable software simplifies regression testing.
Real World Example
A regulated product team is preparing a release where Maintainability appears in reviews, test design conversations, or defect triage rather than as an isolated glossary word.
The risk is that the team treats Maintainability as interchangeable with nearby ISTQB terms. That makes test scope blurry and can lead to weak evidence for the release decision.
The tester anchors the discussion in the official definition, asks where the concept appears in the product, and designs examples that show the difference between Maintainability and similar ideas.
The page becomes useful in practice because Maintainability is connected to a specific testing decision, not memorized as a detached definition.
Practice Questions
Question 1
Which statement BEST describes Maintainability in the context of ISTQB terminology?
Question 2
A tester needs to explain Maintainability to a non‑technical stakeholder. Which approach is MOST appropriate?
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