The MOS and the DAT batteries have been shown previously to possess equal validity for predicting final marks in 10th grade English, Mathematics and Science. Using the multiple regression equations derived in an earlier study, predictions were made of final grades to be attained at the end of the sophomore year of 88 male and 65 female students drawn from an independent sample. Cross-validity coefficients determined by correlating the actual and predicted final marks support the original findings and attest to the greater relative efficiency of the MOS battery.
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