"For the developmental approach to become more than an abstract framework or a philosophical perspective, practitioners need concrete policies and procedures that align youth justice with the science of adolescent development. This briefing paper describes the Positive Youth Justice model and assesses its potential as a tool for strengthening reform" (p. 1). Sections cover: introduction to positive youth development (PYD); Positive Youth Justice (PYJ) Model; two core assets-learning and doing, and attaching and belonging; developmental knowledge and justice practice; developmental science; Changing the Frame table-six assumptions on the left, three primary lens on the top; implementation challenges; All Evidence-Based Programs Available for Youth Justice table-four population or settings on the left, three intervention approached on the top; the gap in developmental approaches, broadening the reform agenda; and next steps.