A responsibility assignment matrix[1] (RAM), also known as RACI matrix[2] /ˈreɪsiː/ or ARCI matrix or linear responsibility chart[3] (LRC), describes the participation by various roles in completing tasks or deliverables for a project or business process.[4] It is especially useful in clarifying roles and responsibilities in cross-functional/departmental projects and processes.[5]

RACI and ARCI are acronyms derived from the four key responsibilities most typically used: Responsible, Accountable, Consulted, and Informed.