Progress in the classification of functional psychoses

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Abstract
The three most widely used diagnostic systems in American psychiatry-- the Feighner criteria, the Research Diagnostic Criteria, and DSM-III-- appeared sequentially at 4-year intervals. The fact that the latter two systems each incorporated changes in essentially all diagnostic categories implied progress toward greater validity; however, this assumption has rarely been tested directly. To do this, the authors applied each of these three systems to 98 consecutively admitted patients with nonmanic psychoses. Although family history and 6-month follow-up data strongly supported the validity of diagnostic distinctions made in each of the three systems, they did not show increments in validity with successively developed criteria sets.

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