Abstract
Clinical psychologists have long believed that the unevenness of attainment on different kinds of items in an intelligence test may be used to help recognize various mental illnesses. For almost 35 years attempts have been made to discover the relation between mental illness and such qualitative features of intelligence test results. Only within the past ten years have these attempts met with a measure of success. Diagnostic intelligence testing is now an indispensable tool of many clinical psychologists. In this review we shall trace the history of the use of scatter in intelligence and achievement test results. Scatter may be defined as unevenness in the level of attainment on different tests. For example, scatter is seen in a test like the Stanford-Binet in the subject's failing an item on a given mental age level, while he passes other items on higher mental age levels; or it can be seen in the comparison of the score obtained by a subject on a reading achievement test with the score obtained on an arithmetic achieve-
Published Version
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