Increased emphasis on community-based education in medicine requires close collaboration with and cooperation from general practitioners. This study examined what motivates community physicians to participate in office-based education, to explore the most appropriate method for recognizing physicians' efforts and keeping them motivated with their precepting role. A large majority of respondents to a questionnaire survey thought that the opportunity to learn from their own teaching was an important reward. When the preceptors were asked what support would be most appropriate, a teaching certification plaque, continuing medical education courses, and a title were ranked highest, while financial reward was listed as the least important. Considered most essential by community preceptors were constructive feedback from students, medical-school instructors' understanding of the importance of community-based medicine, and the instructors' enthusiastic promotion of primary-care education.