Which edition of the DSM was the first to assume a theory-neutral approach to psychiatric classification and diagnosis?

Question

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The DSM-III, published in 1980, was the first edition of the DSM to adopt a theory-neutral approach to psychiatric classification and diagnosis. Prior to the DSM-III, the DSM-II (1968) and DSM-I (1952) both relied heavily on psychoanalytic theory to inform their diagnostic criteria. The DSM-III-R (1987) was a revision of the DSM-III, and did not introduce any major changes to its theory-neutral approach.

Which Edition of the DSM Was the First to Assume