The RDWTI and the WITS databases were never used as the only sources for an event’s inclusion in the GTD and neither of these databases were comprehensively incorporated into the GTD. On a very limited basis, the GTD may reference other databases or chronologies among the sources of information for individual cases. The GTD does not systematically include records from either RDWTI or WITS. These data collection efforts were conducted by RAND and NCTC independently of START’s GTD collection effort, with their own definitions, inclusion practices, and source requirements. The RAND Database of Worldwide Terrorism Incidents (RDWTI) and the Worldwide Incident Tracking System (WITS) compiled by the National Counterterrorism Center (NCTC) are two important data collection efforts that coincided with the collection of the GTD for several years.
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