The purpose of this research was to evaluate the impact of a staff development program on the performance of principals in one of their most important tasks: the annual evaluation of teachers. The objective was to determine whether the effects of the staff development training could be seen in the quality of documentation provided by the principals in their annual review of teachers whom they found to be "unsatisfactory." The data source consisted of a random sample of personnel files of teachers who had been rated "unsatisfactory." Analyses of the results indicated that the quality of documentation improved over the years and that principals were doing more observations. Other findings reported that documentation was more detailed, improvement suggestions were richer, and instructional terminology was being used. Nearly all the records determined classroom organization to be the single most prominent weakness. Appended are 10 references, 4 figure graphs, and 5 data tables. (SI)