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In their article, Ree and Earles summarized a vast research literature on the efficacy of g, or general intelli gence, in predicting job performance, both in training phases and in application of job knowledge and skills to actual job performance. In every case cited, g correlated from .33 in range-restricted samples to .76 in more general population samples of job applicants. Non-g aptitudes added little to the prediction from g. Critics of the connection between general intelligence and job performance voice their objections and counterpoints in an article and several comments that follow.
Sternberg et al. (1993) studied this question.