This RACI Matrix Rules diagram is a collection of all project activities and the people or roles in charge. All project elements, including planning, testing, design, and support, should be included in your matrix. You can use a spreadsheet, whiteboard, or software solution, among other tools or templates. Communication is essential for clearly understanding expectations and ensuring a smooth project. The matrix's other axis is labeled with project roles. The project roles help to make the matrix more understandable and can be useful for adding any missing data.