How plots come to fail or to be foiled is of great importance to the study of terrorism and to the development of counterterrorism
policy. There can be no comprehensive picture of the threat without analyzing what adversaries planned to do as well as what
they actually managed to accomplish. Examining failed and foiled plots is essential to understanding their intentions as well as
their capabilities. This specific project, “Comparing Failed, Foiled, Completed and Successful Terrorist Attacks,” examines
jihadist plots in the United States (121 plots) and selected allied countries (314 plots) occurring between 1993 and 2017