The validity of the Test of English as a Foreign Language (TOEFL) was examined in relation to prediction of success of 50 Asian students who had completed master's programs in engineering, chemistry, or mathematics. A significant correlation (r = .40, p < .01) was obtained between scores from the TOEFL and overall grade point average. A regression equation using scores from the TOEFL and Verbal section of the Graduate Record Examination was developed.
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Ayers et al. (1977) studied this question.