This study examined two major areas: (1) evaluation of the characteristics, interactions, problem-solving strategies and achievement of seventh- and eighth-grade junior high school students (N=66) as they interacted with a microcomputer in three problem-solving sessions, and (2) determination of the effectiveness of three original microcomputer programs using topics from life science, social studies and environmental science in problem-solving, and a fourth program in specific skill training in organizing data using a matrix. Selected conclusions indicated that: (1) students can improve in problem-solving skills in a short time on a microcomputer; (2) the training session in organizing data into a matrix was successful in introducing a usable new strategy; (3) individuals worked better in teams than alone; (4) subjects were just as motivated when sessions were more infrequent; (5) influence of group interaction enabled subjects of all abilities to successfully participate in and solve problems; (6) all subjects adapted easily and quickly to the use of a microcomputer; (7) subject interest remained high regardless of achievement or variances of individual characteristics; and (8) microcomputers can be considered a viable, motivating aid for the development of some problem-solving skills of early adolescents. (Author/JN)