A responsibility assignment matrix (RAM), also known as RACI matrix or linear responsibility chart (LRC), describes the participation by various roles in completing tasks or deliverables for a project or business process.
It is especially useful in clarifying roles and responsibilities in cross-functional/departmental projects and processes.
RACI is an acronym that was derived from the four key responsibilities most typically used: Responsible, Accountable, Consulted, and Informed
The matrix is typically created with a vertical axis (left-hand column) of tasks or deliverables and a horizontal axis (top row) of roles