The Enright Arithmetic Program is a diagnostic-prescriptive program designed to facilitate an effective remedial effort. The program is based on establishing for each student the set of skills that student needs to learn and also identifies the error pattern causing the student's current failure. Practice materials for each needed skill are provided. This document briefly reports on a pilot testing of the program in grades 5-8 in an urban New England area which indicated that 16.3% of the school's population was on grade level. Scores from the city-wide test in mathematics were used as a pre-post measure of student growth; the criterion-referenced measure in the program was used to assess the effect on curriculum growth. On the first measure, 61% of the students made greater than a one-year gain in computation and total mathematics scores. On the criterion-referenced measure, 82% of the students in grades 6 and 7 and 50% at grade 8 made over a one-year gain in computation. The data were also analyzed to project the impact of the program on below-grade-level students, with results supporting the positive effect of the program on skill acquisition. (MNS)