Every October the American Psychiatric Association holds the Institute on Psychiatric Services, its annual fall meeting for clinicians. The theme for this year's institute is "Multidisciplinary Roles in the 21st Century." A special section in this month's issue highlights the efforts of multidisciplinary teams in the delivery of contemporary psychiatric services. Featured in this section is a case presentation and discussion about "Sam," a challenging patient who has not responded to intensive community-based treatment. The discussion highlights the importance of a multidisciplinary approach to service delivery. Case discussants are a state mental health commissioner and seven other mental health professionals representing six disciplines (see page 1318). In the second article in the special section, Robert Paul Liberman, M.D., and his colleagues describe the broad array of competencies that the various members of the multidisciplinary team bring to the task of psychiatric rehabilitation (see page 1331). Thousands of prison inmates with mental disorders receive treatment while incarcerated. Kenneth L. Appelbaum, M.D., and associates discuss the role of correctional officers on prison treatment teams, a topic that has received little attention (see page 1343). Schools are the primary site for the delivery of mental health services to children and adolescents. Mark D. Weist, Ph.D., and his coauthors describe the growing movement to expand school mental health programs by creating multidisciplinary partnerships between professionals in the school system, the mental health system, and the public health system (see page 1348). Because the multidisciplinary team is so important in all treatment settings, it must develop mechanisms to improve its effectiveness. Christopher G. Fichtner, M.D., and his colleagues describe a self-assessment training program for multidisciplinary mental health teams (see page 1352).