This report presents the procedures, results, and conclusions of a study designed to compare the achievement in beginning college physics of students completing PSSC high school physics with students completing a traditional high school physics course. Factors of ability and achievement were held constant while scores on the criterion of marks in beginning college physics were compared. Mean achievement in college physics for students with a background in PSSC physics was not significantly different from that of students who had traditional physics. However, there were significant differences in the mean achievement between (1) students who took PSSC physics and who did not take high school physics, and (2) students who took traditional physics and those who did not take high school physics. The investigator suggests that his findings indicate that chances of success in college physics would be improved by taking physics in high school. (LC)