Class Action is the second phase of the Project Northland alcohol-use prevention curriculum series. Class Action (for grades 11-12) and Project Northland (for grades 6-8) are designed to delay the onset of alcohol use, reduce use among youths who have already tried alcohol, and limit the number of alcohol-related problems experienced by young drinkers. Class Action draws upon the social influence theory of behavior change, using interactive, peer-led sessions to explore the real-world legal and social consequences of substance abuse. The curriculum consists of 8-10 group sessions in which students divide into teams to research, prepare, and present mock civil cases involving hypothetical persons harmed as a result of underage drinking. Using a casebook along with audio-taped affidavits and depositions, teens review relevant statutes and case law to build legal cases they then present to a jury of their peers. Case topics include drinking and driving, fetal alcohol syndrome, drinking and violence, date rape, drinking and vandalism, and school alcohol policies. Students also research community issues around alcohol use and become involved in local events to support community awareness of the problem of underage drinking. Class Action can be used as a booster session for the Project Northland series or as a stand-alone program.