The National Child Traumatic Stress Network is made up of three components: (1) National Center for Child Traumatic Stress (Category I) works with the Substance Abuse and Mental Health Services Administration to develop and maintain the Network structure, provide technical assistance to grantees within the Network, oversee resource development and dissemination, and coordinate national education and training efforts; (2) Treatment and Services Adaptation Centers (Category II) provide national expertise on specific types of traumatic events, population groups, and service systems and support the specialized adaptation of effective treatment and service approaches for communities across the country; and (3) Community Treatment and Services Centers (Category III) implement and evaluate effective treatment and services in community settings and youth-serving systems and collaborate with other Network centers on clinical issues, service approaches, policy, financing, and training initiatives. Former grantees of the NCTSN continue their involvement through the Affiliate Program, and governance is provided through the NCTSN Steering Committee and national Advisory Board.