The OJP Diagnostic Center is a resource for community leaders seeking to implement data-driven interventions to address public safety, juvenile justice and criminal justice issues. The Diagnostic Center will provide assistance in identifying, assessing, and implementing evidence-based strategies to combat crime and improve public safety at the state, tribal, or local levels. The Diagnostic Center helps communities use local data to frame public safety and criminal justice issues, and then choose among effective strategies to address them. An engagement with the Diagnostic Center entails weeks or months of collaborative work, remote and on-site, with specialists in a process that capitalizes on the expertise of Diagnostic Center staff and of community stakeholders. The Diagnostic Center’s value lies in its ability to offer real-time diagnosis in partnership with criminal justice policymakers and practitioners to achieve system-wide change. Communities engaged with the Diagnostic Center benefit from this collaborative approach that connects them to expertise, training, and technical assistance resources tailored to particular community risks and strengths.