This document, developed by the National Center on Advancing Person-Centered Practices and Systems may serve as a useful tool for States, Tribes, and Territories that are seeking to develop local definitions of person-centered thinking, planning, and/or practice based on nationally recognized principles. This scan specifically focuses on criteria and definitions of person-centered thinking, planning, and practice within human service systems and organizations. To perform the scan, NCAPPS reviewed articles, policy statements, regulations, and websites of national aging, disability, and mental health organizations. In addition it is informed by a review of literature focused on articles, reports, websites, and other documents that were frequently cited and that were written by leading experts in these fields.