“This brief summarizes the efforts of states involved in the Justice Reinvestment Initiative (JRI), a program designed to identify and implement cost-efficient, evidence-based criminal justice reforms. To do so, jurisdictions use data analysis to identify criminal justice population and cost drivers and then develop policy options to reduce those drivers.” Correctional population and cost drivers include: parole and probation revocations; sentencing policies and practices; insufficient and ineffective community supervision and support; and parole system processing delays and denials. Strategies for reducing the costs related to these challenges include: risk and needs assessment; expansion or improvement of problem-solving courts; intermediate and graduated sanctions; increased use of evidence-based practices; expanded incentives, such as good time and earned credits; penalty changes; streamlines parole processes and expanded parole eligibility; expansion and increase in community-based treatment programs; mandatory supervision requirements; and accountability measures. The principle ways cost savings, resulting from improved justice systems, are reinvested are: reinvestment of tangible savings-funding based on the amount of costs that have been saved; up-front reinvestment--funding based on projected future savings; and reallocation-funding based on redirecting existing monies.