City-as-School (CAS) is an alternative high school linking students to various out-of-school learning experiences throughout New York City. In 1985, CAS was awarded a National Diffusion Network (NDN) 4-year replication grant to disseminate the model to other schools and districts throughout the country. During 1988/89, its fourth year of implementation, CAS/NDN sought to replicate its model at 12 sites in different parts of the country, focusing special attention on at-risk students. Objectives included follow-up activities at the sites, development of materials for in-service teacher education, and modified "turn-key" training of replicator staff to become disseminators themselves. This evaluation found that the project's ongoing outreach efforts, focus on at-risk students, and in-service training objectives were achieved. The remaining objectives were only partially met due to limitations of time and resources. The following recommendations for improvement are suggested: (1) develop a plan for monitoring the progress of replicators at each site; (2) develop assessment measures based on student behavior, such as credits earned and attendance; (3) continue efforts to develop new disseminators in a large number of states and a higher number of inner-city schools; (4) attract more ninth- and tenth-grade students to the program; and (5) continue to update the program and develop financial independence. (FMW)