This report, the first of two volumes, identifies effective practices used in 16 successful migrant education programs. On the basis of student outcome data, the projects were selected from 153 programs nominated by state directors of migrant education. Observation of project services; review of project records; and interviews with project staff, students, and parents revealed a core set of practices for improving migrant students' academic achievement, attendance, and educational and career aspirations. Successful migrant education projects were developed through practices such as the following: (1) canvass and network extensively to identify students in need; (2) ensure that students' instructional needs are met; (3) provide extra academic learning time; (4) provide proactive support services; (5) increase parent involvement; (6) decrease dropout rates; (7) use evaluation methods to monitor and increase program effectiveness; and (8) implement efficient program management strategies. This report describes specific practices in each of these areas, discusses factors to consider in attempting to replicate the practices in other migrant education projects, and presents illustrative vignettes. Appendices outline components of this study's conceptual model and also index the case studies found in Volume II. (SV)