The STAG framework arose directly from the July 1998 transport White Paper, Travel Choices for Scotland, which established the new policy framework for transport in Scotland. The White Paper heralded important developments in policy with a clear focus on three key aims:
The draft version of STAG was issued for use and consultation in 2001 with the final version published for use in September 2003. The guidance was then subsequently updated and launched on ‘Scot-TAG', a web based platform, in November 2005.
More broadly, the guidance outlined in STAG is centred on providing a transport appraisal process framework which is centred on outcomes against the five STAG Criteria, namely: