This paper describes a 2-year practicum in pediatric psychology at the Bay State Medical Center, as administered by the Psychology Department of the University of Massachusetts. An overview of the pediatric psychology program and its collaborative design between clinical and developmental psychology is given. The learning objectives, and the academic and clinical components of the program are outlined, all of which include joint coursework between psychologists and pediatric residents and case conferences with pediatric residents. Clinical casework further includes assessment and short-term treatment of children with combined medical, developmental, and psychological problems. Two case studies are presented to illustrate the interdisciplinary nature of the program. Evaluation of the program's success is explored in the areas of benefits to the students, process, costs, and research efforts. Program areas needing improvement are addressed. The paper concludes with a list of collaborative research studies which were initiated in the first 2 years of the program. (BL)