Model Coverage
Model coverage measures the extent to which elements of a behavioral or structural model have been exercised during testing.
“The coverage of model elements.”
(Definition reproduced from the ISTQB Glossary. Copyright belongs to ISTQB.)
View the complete ISTQB GlossaryWhat is Model Coverage?
Coverage metrics help determine whether sufficient parts of the model have been tested, similar to code coverage in structural testing.
Model elements: States, transitions, decisions, or paths may be measured.
Coverage objective: Higher coverage increases confidence in model-based tests.
Measurement: Expressed as a percentage of covered model elements.
Real World Example
A tax calculation module applies different deductions depending on income band, residency status, and submitted documents.
Reviewing the final tax amount is not enough when important code paths may never execute during testing. Model coverage helps the tester reason about the structure behind the result.
The tester works with the developer to identify decisions or paths in the calculation logic and designs inputs that exercise the meaningful alternatives.
The team gains better evidence about hidden logic because Model coverage connects tests to the implementation structure where certain defects can hide.
Practice Questions
Question 1
Which statement BEST describes Model coverage in the context of ISTQB terminology?
Question 2
A tester needs to explain Model coverage to a non‑technical stakeholder. Which approach is MOST appropriate?
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