The move, which is backed by the Home Office, intends to underline the retailer's right to ask customers for ID if they appear to be under-21.
The signage will include posters, shelf signs and staff badges to reinforce the 'Challenge 21' theme.
The RASG is also backed by trade bodies including the British Retail Consortium and the Wine and Spirits Trade Association.
The group hopes to create a culture in which young people can expect to be challenged if they attempt to buy alcohol.
This article was first published on Marketing