Test Traceability Metrics measure the alignment and coverage between test cases and the requirements or specifications they are designed to validate. These metrics ensure that all requirements are adequately tested, providing a clear mapping between requirements and their corresponding test cases.
Key Components of Test Traceability
- Requirement Coverage: Ensures all functional and non-functional requirements have corresponding test cases.
- Defect Traceability: Tracks which test cases uncovered specific defects, linking them to requirements.
- Test Case Execution: Monitors how many test cases linked to requirements have been executed successfully.
Importance of Test Traceability Metrics
- Ensures all requirements are tested, reducing the risk of untested functionality.
- Provides accountability and clarity for stakeholders.
- Helps identify gaps in the testing process.
- Supports compliance and audit requirements, especially in regulated industries.
Coverage Requirements and Metrics
Coverage refers to the percentage of requirements or functionalities tested during the process. Common metrics include:
Table:Test Traceability Metrics
How Much Coverage is Mandatory?
The level of coverage required depends on several factors, including the project's domain, risk profile, and regulatory requirements:
Regulated Industries (e.g., Healthcare, Aviation, Finance):
- Typically require 100% requirement coverage to ensure all specifications are validated.
- May mandate 90-100% code coverage for critical systems.
High-Risk Systems:
- Aim for 100% requirements coverage and high code coverage for critical modules.
- Defect traceability is crucial to ensure critical defects are resolved.
General Software Development:
- 80-90% requirement coverage is often acceptable for non-critical systems.
- Code coverage goals vary but often aim for 70-90%.
Agile/Incremental Development:
- Coverage goals may vary sprint-to-sprint but strive for full coverage of completed stories.
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