Promoting social change is the goal of the seven community case studies reported in this book. Each study is a "natural experiment" that involved long-term research, close collaboration between researchers and the host community, and the application of research methods and findings to social change goals within the community. The following reports describe collaborative research in the United States: (1) "Urban Comadronas: Maternal and Child Health Research and Policy Formulation in a Puerto Rican Community" (J. J. Schensul, D. Denelli-Hess, M. G. Borrero, and M. P. Bhavati); (2) "In the People's Service: The Kansas Kickapoo Technical Assistance Project" (D. D. Stull, J. A. Schultz, and K. Cadue, Sr.); (3) "Community Action and Social Adaptation: The Farmworker Movement in the Midwest" (W. K. Barger and E. Reza); and (4) "Linguistics in Action: The Hualapai Bilingual/Bicultural Education Program" (L. J. Watahomigie and A. Y. Yamamoto). The following reports describe collaborative research in the Third World: (1) "Against the Odds: Collaboration and Development at Vicos" (P. L. Doughty); (2) "The Mexican Urban Housing Project: A Collaboration between 'la Area Tecnica y la Area Social'" (A. D. Murphy, I. C. Fernandez, H. A. Selby, and I. R. Love); and (3) "Saving the City: University Research, Political Action, and the Squatter Problem in Davao City, Philippines" (R. A. Hackenberg and B. H. Hackenberg). Also included is a methodological chapter by M. A. Gibson with the title "Collaborative Educational Ethnography: Problems and Profits." A 314-item bibliography is appended. (FMW)