Our own previous research found that we could reduce alcohol consumption by about three drinks per week at a six-month follow-up using a minimal, personalized feedback Internet-based intervention. Building on this, the current project will attempt to increase the impact of Internet-based interventions as well as produce sustained reductions in drinking by adding an extended online self-help service to this already promising minimal intervention. More specifically, this randomized, double blinded study will compare and evaluate the efficacy of two different degrees of treatment intervention for problem drinkers: a minimal one ("Check your Drinking") and a full one ("Alcohol Help Centre").