THE Commission on Youth is co-ordinating government and community forces to attack underage drinking, found to be a worrying problem in a recent survey. The commission has set up a working group on the underage drinking problem, with members including working youth, young people at voluntary agencies, media representatives, and out-reaching social workers. Others include officials from the Department of Health, Hong Kong Council on Smoking and Health, and the Action Committee Against Narcotics (ACAN). The setting up of the group was triggered by an ACAN survey which found 73.1 per cent of the 81,100 secondary students interviewed drank beer or wine. Members of the commission have expressed concern that excessive drinking would result in dependency and might lead to drug abuse and unsocial behaviour. The group will study in detail if sufficient work is being done to tackle underage drinking at present and will suggest recommendations which might include banning the sale of alcoholic drinks to youngsters at retail outlets. ''We will send letters to the Social Welfare Department, non-government organisations and the liquor licensing boards of the two municipal councils to ask about their response to the survey. ''The commission is acting as the co-ordinator in addressing the underage drinking problem,'' Eric Li Ka-cheung, legislator and chairman of the commission, said. Mr Li who also chairs the working group said they also needed to find out more scientific information such as medical reports on the effects of excessive drinking, and how parents could influence underage drinking.