This study evaluated the effects of a personalized computer-assisted mathematics problem-solving program on the performance and attitude of Taiwanese fourth grade students. The purpose of this study was to determine whether the personalized computer-assisted program improved student performance and attitude over the nonpersonalized program. One-hundred-sixty-five (165) Taiwanese fourth-grade students participated in the study. The research used the results to determine if the computer-assisted program was effective between the two groups. The results of the study showed that the personalized computer-assisted program on mathematics improved student performance and attitude. The achievement of students in the personalized group was significantly higher than those in the nonpersonalized group. The posttest score of the personalized group was significantly higher than the posttest score of the nonpersonalized group. The attitude of the personalized group was significantly more positive than that of the nonpersonalized group. (Contains 2 figures and 5 tables.)