Providing effective behavioral supports to decrease challenging behavior and replace it with appropriate alternative skills is essential to meeting the needs of many individuals with intellectual and developmental disabilities (IDD). It is also necessary for fulfilling the requirements of Medicaid-funded individual support plans and is important for moral, ethical, and societal reasons. Unfortunately, there is no national standard for behavioral support practices or source of information on the status of behavior support policies, practices, and services for adults with IDD at either state or national levels. The collection of comprehensive data on state behavior support definitions, provider qualifications, training, and oversight requirements is a necessary starting point for the development of plans to address needed policy and practice changes. This survey is the first national assessment of state policies and practices regarding the definition and delivery of behavior support services to people with intellectual and developmental disabilities receiving publicly financed supports in the United States.