An analysis of an information system's requirements, functions, and interdependencies used to characterize system contingency requirements and priorities in the event of a significant disruption…

A Business Impact Analysis (BIA) systematically identifies and evaluates the potential effects of a business disruption, detailing critical functions, system requirements, interdependencies, and recovery priorities to inform contingency planning.

A Business Continuity Plan (BCP) is a comprehensive plan that outlines how an organization will continue operations during and after a disruption, using the output of a BIA.

A Business Recovery/Disruption Plan (BRP) is a general term often encompassing BCP or DRP, but the BIA is the specific analytical process described.

A Disaster Recovery Plan (DRP) specifically focuses on the recovery of IT systems and infrastructure following a disaster, which is guided by the information gathered in a BIA.