For every person in prison, roughly two people are serving their sentences on probation or parole at a fraction of the cost of incarceration. Over the past 20 years, corrections professionals and researchers have identified a range of successful, community-based strategies that reduce the rate at which these individuals return to prison for new offenses or for breaking the rules of their supervision. These publications summarize some of the approaches that work to change the behavior of offenders and of the system that supervises them.