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and the early editions in the '50s and '60s were highly subjective
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and based on Freudian theory.
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But since 1980 there's been real effort to make the criteria
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much more objective, to make the set of behaviors
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or observations that are required to diagnose someone
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be things that are observable, that you can see in other people ,
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that they can report on reliably, and that one clinician
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and another clinician will agree upon.
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So, the DSM gives lists of symptoms with the required symptoms for a diagnosis,
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the number of symptoms that have to be present,
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and the notions of deviation, dysfunction
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and distress are built into these criteria.