This volume, the fourth of a five-volume series, contains three onsite case studies of organization development (OD) selected from a sample of 76 school districts. The purpose of the case studies was to analyze in detail different types of OD programs and their use. Each case study represents a different OD focus: case study A involves a survey feedback and professional development approach, case study B combines a management by objective focus, and case study C is curriculum-based. From 13 to 21 interviews were conducted with OD coordinators, central administrators, board members, principals, teachers, and change agents. Questions covered description of the OD program, perceptions of the main goals, reasons for success and failure, role of internal and external change agents, consequences and impact of the program, and the future of OD in the district. Some of the findings suggest the need for a reasonably stable district environment, a close linkage between an internal OD specialist and a top manager, a clear image of the program, and a longer time-line for institutionalization. (Author/LD)