The Parkway Program is the prototype school-without-walls created by the School District of Philadelphia in 1967. The program presently consists of four units of approximately 200 students (chosen by lottery from throughout the city), ten teachers, ten to 12 interns, and a Unit Head and administrative assistant housed in four separate non-school locations around the city. The students attend classes in: (1) conventional subject matter areas, the bulk of which are taught by the Parkway teachers, and which usually take place in sites around the city contributed by agencies and institutions, and (2) subject fields not ordinarily available to high school students, offered by volunteers (many from institutions) whose courses are monitored by Parkway staff. To provide intellectual and interpersonal coherence to the program and to offer counseling and basic skill development to all students; Parkway offers a period each day called tutorial. This report poses as the central question: Is Parkway a justifiable public enterprise despite its weaknesses? The program is justified in terms of its goal as seen through the eyes of its major constituencies, in terms of its student body's academic achievement, attendance and attitudes, and in terms of a perspective for viewing the program as part of the public school's commitment to meet the educational needs of all children. (Author/JM)