Project Impact, a support system for the administrative and instructional staff in the Onondaga-Madison BOCES schools, was designed to support a diagnostic-prescriptive approach in the classroom by providing the information the teacher needs in order to make instructional decisions. It consists of a series of computer programs with a large storage bank of data to assist school personnel in curriculum development, validation and dissemination, standardized achievement testing, criterion referenced testing, student achievement data analysis, long term storage and retrieval of student test data, and the identification and reporting of students in categorically aided programs, as well as those in need of remediation. The efficacy of this instructional management information system on student learning has been substantiated through a systematic evaluation of its implementation in 45 classrooms that served as an initial systems pilot test. (Author/MER)