A responsibility matrix shows who has primary responsibility and who has support responsibility for the activities listed in the WBS.

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A responsibility matrix, also known as a RACI (Responsible, Accountable, Consulted, and Informed) matrix, is used to define and communicate the roles and responsibilities for a project or a specific task within a project. It shows who is responsible for performing an activity, who is accountable for ensuring the activity is completed successfully, who needs to be consulted during the activity, and who needs to be informed about its progress. Therefore, it does show who has primary responsibility and who has support responsibility for the activities listed in the WBS.

A Responsibility Matrix Shows Who Has Primary Responsibility and Who