This article discusses a solution-oriented and incremental approach to solving major social problems. If we are to solve important social problems such as child abuse, delinquency, and illiteracy, researchers need to generate effective programs that can be replicated and social service providers need to implement those programs with fidelity. The Teaching-Family Model, based on over 30 years of research, evaluation, and program experience, has been replicated across North America. We present an analysis of 792 attempted replications over a period of 15 years. The analysis reveals certain aspects of the treatment program that were found to be sufficient conditions for treatment program implementation and survival. These "Site services" are described and the implications for effective practices in services for children are presented. (Contains 1 table and 4 figures.)