A traceability matrix is a document that maps the requirements of a project to the deliverables, test cases, and changes that are produced to meet those requirements. It helps the project manager to track the origin, status, and impact of each requirement throughout the project life cycle. A traceability matrix can also identify who requested or approved each requirement. Therefore, the project manager can use the traceability matrix to identify who requested the specific item that caused the regression test to fail12.