In this Special Section, 7 studies focusing on the PSY-5 model of individual differences relevant to adaptive functioning are presented. The first study by Harkness, McNulty, et al. (this issue) describes the development of the revised PSY-5 scales for the MMPI-2-RF, followed by another article by Harkness, Reynolds, and Lilienfeld (this issue) arguing for the adoption of a review of systems strategy for evaluating psychological functioning. McNulty and Overstreet (this issue) describe an alternative hierarchical strategy for organizing the interpretation of the MMPI-2-RF using the PSY-5 scales. Extending the PSY-5 model to adolescents, Veltri et al. (this issue) examine the convergent and discriminant validity of the MMPI-A PSY-5 in predicting violent delinquent behavior. Bagby and colleagues (this issue) examine the hierarchical structure of the PSY-5 model across nonclinical and clinical samples and, with a few notable exceptions, find the PSY-5 model to map well onto the DSM-5 personality trait dimensional model. Finn, Arbisi, Erbes, Polusny, and Thuras (this issue) examine the convergence between the DSM-5 proposed trait dimensions and PSY-5 model demonstrating the potential for the MMPI-2-RF PSY-5 scales to serve as a bridge between DSM-5 and DSM-IV personality disorder diagnoses. Finally, Sellbom, Smid, de Saeger, Smit, and Kamphuis(this issue) directly examine the convergence of MMPI-2-RF PSY-5 scales with DSM-IV personality disorder categories and proposed DSM-5 trait dimensions further establishing the potential for the PSY-5 scales to serve as a bridge between DSM categorical and dimensional diagnostic schemas.