RecruitingBehavioural interventionJust-in-Time Training for Youth MentorsThis study will evaluate the usability, feasibility, and acceptability of a novel multi-level Just-In-Time Training (JITT) implementation strategy (JITT-EBP) that aims to equip mentors and mentor supervisors to implement evidence-based practices (EBPs) with fidelity using methods that are sustainable in rural communities. JITT-EBP integrates (a) self-directed, on-demand, online training modules for mentors and mentor supervisors, (b) synchronous evidence-based supervision strategies, and (c) an apprenticeship delivery model in which EBPs are co-led by an experienced mentor and a novice mentor, providing opportunity for in-the-moment training and support. The study will conduct a pilot hybrid type 2 effectiveness-implementation trial to evaluate the use of JITT-EBP compared to usual training for implementing mentor-delivered Interpersonal Psychotherapy-Adolescent Skills Training (IPT-AST), an evidence-based depression prevention program. 96 adolescents (age 12-17) and their parents, 8-18 mentors (depending on amount of turnover), and 4 mentor supervisors will be enrolled in the trial.