Measuring General Intelligence by Interview 1Read at the annual meeting of the National Vocational Guidance Association, Atlantic City, Feb. 21, 1930.

30 months mental age, and the criterion used was a composite of the Otis Higher Self Administering Test of Mental Ability, the Terman Group Test of Mental Ability, and Army Alpha Form 9. In spite of these facts, the writer has no desire to recommend this technique too heartily?for several reasons. In the first place, the particular interview used in the original investigation cannot very well be used in any but a purely experimental set-up. For the vocational guidance situation, or the employment situation, different interviews would have to be standardized. Several workers, including the writer, have made a beginning on this, but all have found that the difficulties involved in constructing plausible yet discriminating items were all but insuperable. In the first place, items in such a disguised test depend upon their known level of difficulty in comprehension for their validity, and also on the certainty with which the interviewer can tell whether or not the inter-