For each test level, suitable test metrics need to be defined and collected. Test metrics allow quantitative statements regarding product quality and the quality of the development and test processes and form the basis for transparent, reproducible, and traceable test process planning and control.
Based on the measurement objects, we get test-case-based metrics, test-basis- and test-object-based metrics, defect-based metrics, and and cost- and effort-based metrics.
Complexity metrics such as lines of code (LOC) and cyclomatic complexity (McCabe metric) are required for risk-based testing. Test metrics, too, serve as indicators for project and product risks.
Historicized incident data allows for defect-based metrics as well as statements regarding residual defect probability and system reliability.
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