Global Assessment of Functioning

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The Global Assessment of Functioning (GAF) is a numeric scale used by mental health clinicians and physicians to rate subjectively the social, occupational, and psychological functioning of an individual, i.e., how well one is meeting various problems in living. Scores range from 100 (extremely high functioning) to 1 (severely impaired). The GAF scale was originally developed in 1989 by the American Psychiatric Association and used in the DSM-IV. However, it was replaced in the DSM-5, published in 2013, by the World Health Organization Disability Assessment Schedule 2.0 (WHODAS 2.0). This scale enables a cross-disease and culture-independent assessment of functional health in key areas of life. The WHODAS 2.0 is considered more detailed and objective than a single global assessment using the GAF scale. The 36-item version of the WHODAS 2.0 is also included in the ICD-11.

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