How Requirement Traceability Matrix is useful ?

A requirements traceability Matrix helps in:

1. Ensuring 100% test coverage
2. Showing requirement/document inconsistencies
3. Displaying the overall defect/execution status with focus on business requirements.
4. If a certain business and/or functional requirement were to change, a TM helps estimate or analyze the impact on the QA team’s work in terms of revisiting/reworking on the test cases.