Project managers like using a Responsibility Assignment Matrix to identify the role of the various members of a project team. This matrix is a structural chart in which is visually made clear what should be done by whom. In the matrix it is clear what the tasks and responsibilities are of each of the team members.
The RACI matrix or RACI chart is used in order to have a good overview of a (complex) project of the various members of the project and their individual responsibilities. This matrix describes the participation by various roles in completing tasks or results for projects or business processes on completing the tasks or results in an orderly fashion.