The instrumental use of evidence-based research for influencing the passage of reform efforts affecting the juvenile justice system in Ohio is explained. “Many states across the country face the challenges posed by young people in the juvenile justice system. Ohio is among the few states that has created and implemented innovative funding strategies and relied on research and evaluation to improve its approach” (p. i). Sections following an executive summary are: introduction-case study as a learning tool and overview of partners and policy change with a focus on child well-being; leveraging the policy window-political climate, juvenile justice landscape in Ohio pre-reform and key stakeholders; juvenile justice as a compelling social problem-the role of policy research in making the case for reform; agenda-setting and framing solutions to “invest in what works”-using research to inform a policy reform plan; spheres of influence model-core team and collaborative strategy for juvenile justice policy reform; juvenile justice policies achieved within House Bill 86 reflect research-based, child development, and well-being perspective; and principles and implications for future policy reform efforts.