One-hundred-seventy-six male and 116 female college freshmen took part in a questionnaire study of sex differences in attribution of achievemnt. Achievement was operationalized as grade point index, a performance measure of significance to the subjects, where success-failure feedback is contingent on one's own performance. The best predictor of future grade point average was the previous semester's grades. Expectancy was also predictive of future achievement but through its association with past achievement. Sex differences in attribution were poor predictors of achievement as well as expectancy. It was suggested that sex differences in attributions may be reflections of sex-role orientation but are unrelated to actual achievement. (Author)