The Terrorist Identities Datamart Environment (TIDE) is the US Government’s (USG) central repository of information on international terrorist identities as established by the Intelligence Reform and Terrorism Prevention Act of 2004. TIDE supports the USG’s various terrorist screening systems or “watchlists” and the US Intelligence Community’s overall counterterrorism mission. The Terrorist Identities Group (TIG), located in the National Counterterrorism Center’s Information Sharing & Knowledge Development Directorate (ISKD), is responsible for building and maintaining TIDE.