Over the past six years, 17 local jurisdictions across the country have implemented policies to reduce their jail populations and costs, improve public safety, and increase the efficiency of their justice system. Through the Justice Reinvestment Initiative, sites implemented policies to address frequent front-end users, improve pretrial strategies, apply evidence-based practices in community supervision, and enhance data systems and capacity. This brief summarizes those strategies, identifies common themes across sites, documents outcomes to date, spotlights successful efforts, and highlights keys to successful reform.