 The classification system is based on the Australian Bureau of Statistics, Australian Standard Geographical Classification - Remoteness Areas (ASGC-RA).The current system groups locations into 'remoteness areas,' ranging from RA1 to RA5, to determine eligible areas for MRBS Scheme doctors completing their return of service obligations (RSO).The ASGC-RA classification system is updated after each census, and so may change over time.