Three Minnesota correctional institutions used computer-assisted instruction (CAI) on PLATO terminals to improve reading and mathematics skills: (1) the State Reformatory for Men, St. Cloud (males, ages 17-21); (2) the Minnesota Home School, Sauk Centre (males and females, ages 12-18); and (3) the State Training School, Red Wing (males, ages 13-18). Curriculum packages included PLATO Corrections Project Mathematics Curriculum, the Basic Skills Mathematics Curriculum, and the Basic Skills Reading Curriculum. Program evaluation concentrated on basic skills; students' attitudes toward mathematics, reading, learning, and CAI; success in program implementation; and staff attitudes toward CAI. Suitability of the curricula and technical issues in administering CAI programs were also considered. Achievement gains were measured by the Tests of Adult Basic Education (TABE); the Student Attitude Survey and interviews were used to elicit students' and teachers' reactions. Results did not clearly support CAI effects on achievement, although the students did show progress. Students' attitudes showed improvement, but this was not related to instructional time or use of the computer. Students' attitudes toward CAI were generally positive. Staff attitudes were positive at two of the institutions. (Recommendations, the four-part student Attitude Survey, and interview questions are appended). (GDC)