A program is described that was developed, implemented, and evaluated at the P.K. Yonge Laboratory School at the University of Florida. It was designed to help middle school students to increase competencies in basic computation. The nine criteria guiding development were: 1) individualized instruction; 2) greater student responsibility for learning; 3) positive reinforcement for student successes; 4) computation skills basic to developing skills for living; 5) procedures to assist in focusing student and teacher on one skill at a time; 6) a records system; 7) instruction sequence from easy to difficult; 8) design for ready incorporation into existing programs; and 9) compatibility with minimum performance standards in Florida Department of Education basic skills. The program was designed to be individual and self-paced, with pupils primarily responsible for determining when they have acquired sufficient skill to demonstrate mastery. The program was tested with the sixth, seventh, and eighth-grade classes during 1978-79. In general, pupils obtained positive changes in grade equivalent scores of more than one year. It was felt the results were sufficiently positive to warrant examination of use of the system in public schools. (MP)