The Interwinery Analysis Group was founded in the Barossa Valley in 1983. Prior to this, informal comparison of results was made by a few laboratories in the area, beginning in about 1966. The Group commenced with approximately six members, among them Orlando, Seppelts, Penfolds, Saltram and Tollana. Incorporated in December 1992, the group now includes over 200 members from every winemaking region in Australia plus wineries and laboratories from New Zealand, South Africa, the United States and France, making it the largest proficiency testing organisation of its type in the world.

The Group currently holds two meetings a year. The first one in July or August is in the form of a full day seminar with several guest speakers providing presentations on a wide variety of relevant topics. The second meeting in November or December is a mini-seminar with a greater focus on the proficiency testing results from throughout the year. it also provides an open forum for discussion of related issues. This format for meetings has been widely welcomed by the members as shown by the excellent attendances at our recent meetings. These meetings also encourage members to interact on a social level.