Substance use among youth remains a major public health problem. About half of all 12th graders have tried an illicit drug and over 72% of this same age group have used alcohol. Rates of abuse of prescription opioids among youth are estimated to have increased about 542% in the past decade. Although effective substance abuse treatment programs for youth exist, they are currently of limited reach. Only 1 in 10 adolescents who need substance abuse treatment receive any care. An interactive, computer-delivered psychosocial (skills-training) intervention has the potential to address these challenges, as it allows for complex interventions to be delivered at a low cost, without increasing demands on staff time or training needs. It may also be highly acceptable to youth and enable widespread dissemination of science-based treatment in a manner that ensures fidelity.