The Office of Inter-Agency Affairs and Coordination was established in 1967 as a division of the Department of Social and Economic Affairs and became a separate department in 1970. It was dissolved at the end of 1978. The primary functions of the Office were: to represent the Secretary-General in communication with specialized agencies and intergovernmental organizations such as the International Atomic Energy Agency (IAEA); to assist departments and related bodies in matters of coordination with these inter-organizational bodies; to assist with coordination and resolving of differences between these inter-organizational bodies; to assist the General Assembly, the Economic and Social Council, their subsidiary organs and intergovernmental organizations in the formulation of decisions involving system-wide activities; and to serve as the secretariat for the Administrative Committee on Coordination (ACC).