This poster will review several recent studies investigating the development and evaluation of a brief instrumental SBM curriculum designed for implementation within the constraints of the school system. Specifically, this poster will highlight the results from a series of 3 iterative randomized controlled trials and present an empirical investigation of how different training and supervision models influence mentors satisfaction and anticipated continuation in school-based mentoring. Results from the 3 evaluations demonstrate that successive program modifications intended to infuse evidence-based practices within the context of brief mentoring relationships has successfully improved effect sizes on several outcomes (e.g. life satisfaction, grades, reductions in school disruptive behavior). Although several factors changed in successive iterations of the mentoring curriculum, we present a quasi-experimental evaluation of changes in mentor training and supervision practices between the 1st and second evaluation. Results from this quasi-experiment suggest that changes in training were associated with mentor satisfaction and plans to continue mentoring, in addition to larger and more positive effect sizes on youth outcomes. This poster will offer recommendations for future SBM research and provide access to training and mentoring curriculum involved in the studies.