“Most assessment systems target high-risk offenders. However, standard risk and needs assessments do not necessarily identify needs that are truly criminogenic for each individual; nor do they address responsivity. This is because these systems do not inherently identify either specific strategies and programs that reflect the learning style of the offender or approaches and programs most likely to motivate each offender to change behavior. This paper describes a comprehensive approach to assessment, developed by the National Council on Crime and Delinquency (NCCD), that successfully addresses all three objectives listed above. This methodology was originally embedded in the Client Management Classification (CMC) system and Strategies for Juvenile Supervision (SJS) assessment and supervision systems. It currently is embedded in the Correctional Assessment and Intervention System (CAIS) and Juvenile Assessment and Intervention System (JAIS) … Evaluation outcomes from six separate studies have shown that this methodology significantly reduces recidivism for both probationers and parolees and reduces institutional infractions when used in institutional settings. Results from these studies, which were conducted by different research teams in different jurisdictions across a 25-year timeframe, are summarized in this paper.” Sections included in this report are: introduction; what separates CAIS and JAIS from other assessment models; how CMC and SJS were developed; evaluations of CMC; the Texas Study, 1987; the Wisconsin Study, 1986; Council of State Governments, 2011; the emergence of CAIS and JAIS; supervision strategies; enhancing responsivity through case planning; and conclusion.