A traceability matrix is a document that links requirements to their sources and traces them throughout the project life cycle. It helps to track changes in requirements, assess their impact, and ensure that they are met by the project deliverables. A traceability matrix is a useful tool for document control, as it records the version history of each requirement and the rationale for any changes. A statement of work, a project plan, and a problem or opportunity statement are not methods of document control, but rather documents that describe the project scope, objectives, activities, and justification. References: PMI Professional in Business Analysis (PMI-PBA)® Examination Content Outline, page 9 1; Business Analysis for Practitioners: A Practice Guide, page 121 2