IMPACT is a computer-based information system designed to help school districts share materials and expertise and to implement state-mandated evaluation of student achievement. It is designed to meet local, regional, and state evaluation and reporting requirements. Based upon the diagnostic-prescriptive approach to instruction, it consists of: (1) a master curriculum file containing thousands of instructional objectives, test items, and teaching activities for reading, mathematics and special education; (2) a computer program for scoring and interpreting standardized norm-referenced tests; (3) a computer program for scoring and interpreting locally developed criterion referenced tests; and (4) a student achievement history file for recording scores, objectives mastered, prescriptions assigned, and demographic data. The master curriculum file and criterion-referenced scoring program were pilot tested at six grade levels. Although teachers developed over 1,200 reading activities for the curriculum file, they used only 30% in the pilot classrooms. After six months, students in the pilot project mastered 69% of the activities, 1% below the predetermined level. Teachers were pleased with the quick turnaround time for scoring. (Frank Ambrosie, James Craner, Steve Kidder, and Charles Adams contributed the four papers in this symposium.) (CP)