The predictive validity of the American College Test (ACT) for two classes totaling 2,289 students was investigated at successive intervals over four years of college. Correlational coefficients and expectancy tables substantiated the validity of the ACT for prediction of GPA, for progress, and for graduation within four years. (Author)

The validity of ACT Assessment scores and high school averages for predicting the academic success in college of high school juniors, seniors, and juniors and seniors as a group is reported. Substantial differences in the magnitude of the multiple correlations for these three groups were found. (Author)