This publication evaluates The Robert Wood Johnson Foundation school-based health care centers for medically underserved populations. On-site visits and interviews with staff provided data on the experiences of 24 secondary school-based health centers from their design phase through full-scale operation. The report reviews issues that affect all health centers such as dealing with controversy, making decisions about the centers' location in the schools, working with school nurses, and incorporating school staff. Discussion about the delivery of medical and psychosocial service reveal the comprehensive approach these health centers use. Sections on personnel and organizational management show: (1) the importance of the nurse practitioner or physician's assistant; (2) the benefits and disadvantages of using staff contributed by multiple organizations; and (3) ways to make the health center's environment appealing to students. The report also assesses: the development of relationships among health center staff, school staff and students, including confidentiality practices; impact on classroom instruction; response to emergencies; and costs and funding mechanisms for facility operations. The report concludes with lessons for further initiatives. (Contains 17 references.) (LL)