APA Dictionary of Psychology

a rating scale to assess social activity and independent functioning after traumatic brain injury. The five categories of the original scale are death, persistent vegetative state, severe disability, moderate disability, and good recovery. An extended GOS that divides each of the latter three levels into an upper and lower degree of disability is also available. [originally developed in 1975 by British neurologist William Bryan Jennett (1926–2008) and British psychiatrist Michael R. Bond (1936–  ) at the University of Glasgow, Scotland]