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The Global Assessment of Functioning is a numeric scale used by mental health clinicians and physicians to rate subjectively the social, occupational, and psychological functioning of an individual, e.g., how well one is meeting various problems in living. Scores range from 100 to 1.
The scale was included in DSM-IV, but replaced in DSM-5 with the WHODAS , a survey or interview with detailed items. The WHODAS is supposed to be more detailed and objective than a single global impression. The main advantage of the GAF would be its brevity.
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