This paper reports a study of over- and underachievement of college students, utilizing a computerized multiple moderator technique. The subjects were students at a large southwestern university, the predictors were short forms of the SAT and high school rank, and the criterion was first year grade average. Selected background variables were the potential moderators. The overachievers were characterized as having come from backgrounds where the father was highly educated, the underachievers were observed as having small town origins and high interest in extracurricular activities.