Two classes of community college students having less than the usual minimal preparation required for admission were taught half of a basic science course using individualized instruction and half using traditional instruction. The course was divided into chemistry and physics segments and random halves of each class received the individualized treatment in one segment and the traditional treatment in the other. The individualized treatment was found to yield superior achievement gains and more positive attitudes toward science than the traditional treatment while both resulted in equivalent student satisfaction. No differences between segments were obtained. Of the four treatment-segment combinations, individualized physics appeared to yield the greatest achievement. Individualized instruction was concluded to be effective.