Expert judges see intervals of intelligence from different parts of the scale as unequal in an individually consistent manner and there is also some consistency among judges. There are considerable differences among judges as a function of amount of experience in dealing with the mentally retarded. Highly experienced judges are not influenced in comparing intervals by the traditional categories of intelligence, e.g., Normal, Dull Normal. They also judge intervals from the lower end of the scale as being the largest, whereas other judges see intervals from the upper end of the scale as largest. The implications of the findings for the clinical assessment of change are discussed.
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