Providing impetus to this expanded planning activity has been the emergence of the FEMA Region IX Earthquake Response Plan for the San Francisco Bay Area. This is a site-specific FEMA plan based on a 1974 draft that provided for a full range of Federal assistance during the emergency lifesaving phase following the earthquake. Although this plan never proceeded beyond the draft stage (because of evolving FEMA disaster field operations policy), it served as the basic guide for the development of the Sixth U.S. Army Plan, and has remained a core document for identifying expected Federal agency activities for earthquake recovery in the San Francisco Bay area. In 1979, the emergency response portion of the 1974 FEMA Region IX draft was restructured. The conduct of the post-event response program was shifted from being a centrally directed FEMA activity under the operational control of the Regional Director to a decentralized operation which provides for functional disaster support activities to be assigned by the Regional Director to certain Federal agencies by Mission Assignment Letters. Table 1 indicates functional task assignment areas. Those with the designation "Emergency Support Function (ESF)," have been assigned to other Federal agencies. Table 2 reviews the principal and support agency assignments for each of the ESF functions. On the basis of these anticipated mission assignments, the tasked Federal agencies participated in the development of operational annexes in the 1979 version of the San Francisco Earthquake Response Plan. Upon completion of the annexes, all agencies were then required to develop the necessary agency support plans and standard operating procedures for accomplishing the mission assignment tasks. Additionally, those Federal agencies designated in the plan as principal agencies were tasked with the responsibility of organizing and coordinating the activities of Federal agencies designated as support.