Various model programs for comprehensive health service delivery to adolescents have been proposed and implemented, but few of these programs have been evaluated systematically. This monograph identifies 664 programs that provide comprehensive or integrated services and reports the results of a survey completed by 435 programs. Two-thirds of all such programs are in urban communities; half of all rural programs are school-based. Programs can be grouped into the following models: (1) school-based or school-linked programs (45%); (2) health center-based programs (9%); (3) hospital-based programs (22%); (4) health department-based programs (8%); (5) community-center-based (11%); and (6) other models (5%). Nearly two-thirds require parental consent for the adolescent to receive services, with school-based programs the most likely to require parental consent. In reality, few programs provided comprehensive care such as drug and alcohol treatment or recreation programs. Many more service programs and systematic attempts to provide services are needed if adolescents are to have real access to comprehensive health care. (Contains 5 figures, 20 tables, and 74 references.) (SLD)