The risk-needs-responsivity (RNR) model is used in criminology to develop recommendations for how prisoners should be assessed based on the risk they present, the programs or services they require, and the types of environments in which they should be placed in to reduce recidivism. It was first proposed in 1990 [1] based on the research conducted in the 1960s and 70s by Lee Sechrest, Ted Palmer, and other researchers on classifications of offender treatments. [2] The model was primarily developed by Canadian researchers James Bonta, Donald A. Andrews, and Paul Gendreau. [3] It is considered the best existing model for determining offender treatment, and some of the best risk-assessment tools used on offenders are based on it. [4]
According to the model, there are three main principles that should guide interventions for helping offenders reduce involvement in crime: [4] [5]