The mission of this study was to describe the current and future roles of professional administrators, medical directors, and governing bodies of fee for service and prepay medical group practices of various sizes in such a way as to be potentially useful to health care delivery educators in curriculum evaluation and design. The position was taken that administrative roles derive from, and exist within, the total, generic complex of administration in any organization. This conceptualization led to the seven objectives of the study. Although data concerning all of the objectives are included in this report, the bulk of this document is concerned with objectives 1, 2, and 5, which are: (1) to describe and analyze administration in certain group practice forms of health care delivery, (2) to identify basic differences that occur in administration under different payment plans and under different sizes of group practices, as well as other identified factors, and (5) to describe and analyze the potential future roles of administrators in the management of group practice forms of health care delivery. Chapter headings are Methodological Approach, The Study Participants (And Nonparticipants), Generic Administration in Medical Groups, The Roles (Professional Administrator, Medical Director, and Governing Body), Effects of Size and Payment Mechanism, The Future of Health Care, Future Roles, Summary of Results, Educational Implications, and Conclusions and Recommendations. The annotated data tables consisting of all the data compiled for this final report are organized in a supplementary document. (HD)