The White House. (2007). National Security Presidential Directive-51/Homeland Security Presidential Directive-2. Federal Emergency Management Agency.
This directive establishes a comprehensive national policy on the continuity of Federal Government structures and operations and a single National Continuity Coordinator responsible for coordinating the development and implementation of Federal continuity policies. This policy establishes "National Essential Functions," prescribes continuity requirements for all executive departments and agencies, and provides guidance for State, local, territorial, and tribal governments, and private sector organizations in order to ensure a comprehensive and integrated national continuity program that will enhance the credibility of our national security posture and enable a more rapid and effective response to, and recovery from, a national emergency.