“A growing number of juvenile justice experts are suggesting a new, potentially more effective approach to reducing recidivism: first identify a youth’s risk of re-offending; then match services to his or her specific risk factors and responsiveness to specific types of interventions. This study examined the implementation of risk/needs assessment tools in six juvenile probation offices in two states, and what effects it had on the practices of the probation officers” (p. 1). Sections of this brief are: background; dynamic risk factors for delinquency; the implementation study; whether probation officers conduct risk/needs assessments reliably; whether the use of risk assessment changes juvenile probation officers’ practices and perceptions of risk; whether the use of risk assessment in juvenile probation lead to changes in the way youth are handled; use of assessments in decision-making by juvenile probation officers; change in post-adjudication, out-of-home placement rates; whether the use of risk assessment changes recidivism; why sound implementation of risk assessment is important; implications for policy and practice. The use of assessments results in suitable dispositions, often at lower levels of restriction. The result is better utilization of resources for high-risk youth with no increase in re-offending rates.