This report, commissioned by the Council of Ontario Universities (COU) with input from the Board for Library Coordination and the Ontario Council of University Libraries, makes recommendations for extending university library cooperation in Ontario, and reviews and evaluates the history, development, and present state of Ontario's cooperative activities in relationship to 1968 COU guidelines on the subject. Separate sections cover: (1) the principal agencies involved in university library cooperation; (2) the library milieu in the 1960's; (3) cooperative acquisitions and collection assessment projects; (4) projects involving library resource sharing; (5) the activities of the now defunct library consortium known as the Union Catalogue (UNICAT); (6) the formation of the University of Toronto Library Automated Systems (UTLAS); (7) the preparation of union lists for government documents, serials, microforms, and maps; (8) cooperative and shared cataloging projects; (9) cooperation among library administrators; (10) cooperation among university libraries in other areas of Canada; (11) a tabulation of Ontario's cooperative studies and prjects; (12) an evaluation of Ontario's cooperative activites; and (13) other issues for consideration by COU. Also included are an appendix discussing the impact of new technology on library cooperation, a glossary of acronyms, and a series of 12 recommendations. A COU circuletter preceding the report lists the final recommendations for university library cooperation in Ontario, as adopted by COU in March 1983. (ESR)