Justice reinvestment is a data-driven approach to criminal justice reform designed to examine and address cost and population drivers, and generate cost savings that can be reinvested in high-performing public safety strategies. State and local leaders across the country are striving to improve public safety and maximize return on corrections investments. To support this work, the Bureau of Justice Assistance (BJA) began funding technical assistance providers and State and local jurisdictions to engage in the Justice Reinvestment Initiative (JRI) in 2010. JRI convenes justice system stakeholders and policy leaders to devise data-driven approaches to criminal justice reform, with the goal of generating cost savings that can be reinvested in high-performing public safety strategies. To date, 24 States and 17 localities have engaged in JRI, and the Urban Institute has been collecting data on and monitoring the progress of each of these sites. This brief summarizes interim findings from an assessment of the progress and activities of the 17 localities have engaged in JRI.