This catalog describes 44 school-reform models. It was prepared for the U.S. Department of Education in direct response to the Comprehensive School Reform Demonstration program. The catalog's purpose is to aid schools, school districts, and states as they investigate external models that can be incorporated into comprehensive school-reform programs. The catalog divides these models into two categories: entire-school models, which provide schools with a framework for change covering most or all aspects of school operations, and skill- and content-based models (reading programs, mathematics programs, and so forth), which can be used as building blocks for comprehensive reform. The document contains introductory information on 26 entire-school models and 18 skill- and content-based models. Although all the models are noteworthy, and will figure in comprehensive-reform efforts, the primary criterion for including a model was its strength of impact on student learning. Descriptions of the models were then developed by drawing on books, articles, reports, material prepared by the developers, written responses to information requests, and telephone interviews. Each description lists the origin or scope of the model, a general description, results, implementation plan, costs, student populations, special considerations, selected evaluations, sample sites, contact information, and highlights. Six appendices contain 11 references, components of comprehensive school reform programs, a continuum of evidence of effectiveness, a list of regional educational laboratories, and a list of comprehensive regional assistance centers. (RJM)