The Arc promotes and protects the human rights of people with intellectual and developmental disabilities and actively supports their full inclusion and participation in the community throughout their lifetimes. The Arc is people – people with intellectual and other developmental disabilities, parents and other family members, and friends of people with intellectual disabilities and professionals who work with them. The Arc is a grassroots organization with 140,000 members who are affiliated through approximately 750 state and local chapters across the nation. At the national level, a 22 member national board of directors and a delegate body of representatives from each chapter guide The Arc’s work. National headquarters staff located in Silver Spring, Maryland and Washington, D.C. carry out their decisions and directives.