Provides training and materials for mental health clinicians and substance abuse treatment providers on the complex intersections between psychological trauma and co-occurring substance abuse and dependency. The course includes interactive online modules on understanding the links between traumatic stress and substance use among adolescents, a webinar and lecture presentation featuring expert faculty from the NCTSN, and a four-part Train-the-Trainer video series entitled Trauma and Co-Occurring Disorders: Understanding and Working with Youth and Their Caregivers.