This RACI Matrix is a simple, effective method for defining project roles and responsibilities, providing a comprehensive chart of who is responsible, accountable, consulted, and informed at each stage. The RACI matrix is a responsibility assignment chart that maps out every task, milestone or key decision involved in completing a project and assigns which roles are Responsible for each action item, which personnel is Accountable, and who needs to be Consulted or Informed, as appropriate. The acronym RACI refers to the four roles that stakeholders may have in any project.