School districts in southwest and west central Minnesota have historically led the state in cooperative efforts. The Educational Cooperative Service Unit (ECSU), an intermediary agency that is an extension of the member schools, is responsive to school district needs and is controlled by the member schools themselves. In 1979-80 membership in the southwest and west central ECSU included 99 public schools and 6 non-public schools, representing some 65,000 students. A number of services and programs are offered through the ECSU. Special education efforts include centers offering special education programs and support services, an instructional materials center, and regional consultants for the handicapped, vision impaired, emotionally disturbed and hearing impaired. Instructional services include a teacher center to assist in inservice training, curriculum development, etc.; an information network; an adult "right to read" program; career education; and a nutrition education and training program. Administrative services involve such areas as educational planning and management information systems. The media services include film collections, equipment loans, equipment repair, and a free printing service. This annual report discusses the governance structure, philosophy, goals and membership of the ECSU, summarizes its programs and services, and discusses finance and personnel needs. Appendices include bylaws, ECSU legislation, and a calendar of 1979-80 events. (DS)