What is it?
Traceability matrix can be made more elaborate by tracing the requirements to the design to the code to the test cases. In this way we can come to know which requirement change will affect which part of the design and which part of the code and the test case.Usually this is an excel sheet. Traceability matrix is one which tells the deviation in the current test process with the actual. A requirement Traceability Matrix is a document that traces user requirements from analysis through implementation. It can be used as a completeness check to verify that all requirements are present or that there are no unnecessary/ extra feature.
At each step in development cycle, the requirements code and associated test cases are recorded to ensure that requirement is addressed in the final system. Both user and developer have ability to easily cross - reference the requirements to the design , programming, test cases.