The 2013 National Health Security Preparedness Index (Index), a preparedness measurement instrument developed under direction by the Association of State and Territorial Health Officials in collaboration with the Centers for Disease Control and Prevention, will be released to the public on Wednesday, December 4, 2013 at 11 a.m. at the Senate Dirksen Building, Room 192, in Washington, DC. This first-of-its-kind tool results from one of the largest collaborations on measuring preparedness to date.