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The authors state that the 'psychological testing of children meets a variety of needs arising in medical, psychiatric, or educational practice. By means of an analysis of the different degrees of retardation and acceleration of development, and of the specific nature of atypical forms of mental functioning, testing may help to differentiate between the manifestations of congenital mental deficiency, or specific disabilities, and of various types of maladjustment. This type of psychological testing service reaches its maximum usefulness only when it is used in conjunction with clinical investigation procedures.'