The state of the juvenile justice system in a society significantly impacts every member of that society. At present, research regarding the juvenile justice systems in the United States focuses primarily on two areas: (a) deterrence of crime by juveniles and (b) methods for measurement and assessment to determine the success of interventions related to juvenile crime. Further, most of the existing evidence-backed practices available are based on recidivism as the primary or even sole standard of success, which recent research has shown is an insufficient evaluative method. Thus, there exists little research that both utilizes effective evaluative methods and puts forth best practices for responding to juvenile offenders-especially those who have committed serious offenses. This paper seeks to close that gap by analyzing policies regarding age of accountability, restorative justice, and juvenile detention and incarceration in Massachusetts, Germany, and the Netherlands.