The School Development Program (SDP) Model is a potentially useful alternative means of addressing the ills that plague public schools. Containing elements of the adjustment and social action models, it is an example of the ecological approach to prevention, which views behavior as a function of person and environment. After a background outline of school reform movements, this report describes SDP's major components: (1) governance and management groups, (2) mental health services, (3) parent participation program, and (4) curriculum and staff development. Then it compares SDP to other approaches to school improvement. The rest of the paper reports on observed changes in school achievment levels and school climate variables in the Benton Harbor, Michigan school system where SDP was implemented from 1982-83 to 1985-86. A measureable positive impact was observed in both areas. Appendices provide graphs and tables of data upon which evaluations are based. A 42-item reference list concludes the document. (LHW)