This document contains descriptive reports of the cooperative activities of five institutional members of COMBASE, a consortium of 14 community colleges for the promotion and study of community-based postsecondary education. Following an overview and summary, reports from Florida Junior College at Jacksonville and Kellogg Community College (Michigan) describe the ways these colleges cooperate with community schools in the delivery of community education services, focusing on the dimensions of articulation, resource development and sharing, and program administration. Valencia Community College (Florida), San Diego Community College District (California), and a noncampus college, Pioneer Community College (Missouri) report on their cooperative arrangements with other community-related agencies in terms of a four-fold typology of relationships: advisory relationships, direct assistance, joint ventures, and merger. Among the cooperative activities described are programs with other postsecondary institutions, government agencies, public schools, non-profit service and professional organizations, public service agencies, libraries, and business and industry. (JDS)