The thesis here presented is divided into two parts. part I is largely a theoretical discussion of problems concerning the reliability of mental tests. Suggestions are made for increasing the reliability and general efficiency of tests as instruments for the selection of individuals for specified purposes. Part II is experimental in type, and is devoted to a consideration of the reliability of Moray House Tests of Intelligence, Arithmetic, and Comparisons are made between the reliability of Moray House Group Tests of Intelligence, and the reliability of the Stanford Binet scale (new revision). Data are presented regarding the constancy of the Intelligence Quotient as measured by Group Tests of Intelligence.
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George A. Ferguson (1946) studied this question.