Reviews the hundreds of studies showing that general cognitive ability predicts job performance in all jobs. Shows that general cognitive ability predicts supervisor ratings and training success and that general cognitive ability predicts objective, rigorously content valid work sample performance with even higher validity. (Author/ABB)

The structure of this report is as follows: First, specific aptitude theory and general ability theory, the two theories of the relation between ability and job performance, are presented and differentiated. Second, there is a discussion of problems in the current use of the General Aptitude Test Battery (GATB) and of problems in the use of…

Drawing from work on the meta-analysis of over 500 validation studies of the General Aptitude Test Battery (GATB) by the U.S. Employment Service, the paper presents a methodological message and a substantive message. Gene Glass's methods, as used by Edwin Ghiselli in personnel selection, ignore study artifacts (sampling error, error of…

This paper reviews the now massive general literature showing that psychological tests are fair to minorities. This literature shows that there is no single group validity, there is no differential validity, and tests overpredict rather than underpredict minority job performance. Further evidence in regard to blacks is introduced from 51…

The relationship between general cognitive ability and both training and job performance is reviewed. Existing scientific data show that there are large differences in training achievement and in job performance. Consequently, any good predictor of achievement or performance can yield a large gain in workforce productivity. General cognitive…