The Global Assessment of Functioning, or GAF, scale is used to rate how serious a mental illness may be. It measures how much a person's symptoms affect their day-to-day life on a scale of 0 to 100.

The Global Assessment of Functioning (GAF) is a scoring system that mental health professionals use to assess how well an individual is functioning in their daily lives. This scale was once used ...

In a previous study of a Danish population, it was found that the SAPAS correlated with staff-ratings of externalizing behaviour and global assessment of functioning in a methadone maintenance clinic.