Action research in the Cobb County (Georgia) school district is described. This research is being conducted in the district under three main approaches: (1) co-researcher projects addressing central level issues; (2) district-wide projects; and (3) school-focused action research, including minigrants to teachers. The first three subsections--effects on students, data collection and utilization, and technical assistance--primarily address school-focused action-research projects. This information and the application procedures provided in Appendix B are specific enough to permit school-focused action-research replication in other districts. The remaining two subsections--effects of action research on the culture of the organization and advice for beginning action researchers--characterize action research in a broad district-wide context. The final section provides the authors' reflections about establishing action research in a large (78,000 students in 88 schools) suburban district. Given the size of the district and the number of students, it is fair to say that the impact of action research has been small, but worthwhile. Appendix A tells what teachers and teams studied and presents sample reports of effects on students (two tables), and Appendix B contains a technical assistance packet. (Contains 5 references.) (SLD)