AI is required in responding to terrorism because the amount and diversity of information needed to address terrorism is too complex and varied to be processed and analyzed by the unaided human mind. The information needed to deal with terrorism requires input from anthropology, sociology, psychology, economics, and political science in addition to military tactics. Only AI is capable of identifying potential terrorist targets and devising terrorism countermeasures from such a diversified information input. The computerized analytic system described in this paper, designated as Computerized Analysis of Terrorists and Terrorism (CATT), is being currently developed to use AI in analyzing and responding to the terrorist threat. Goals of the CATT system are to obtain and use improved intelligence information, generate more effective terrorism countermeasures that will not damage the progress of democracies, and identify future terrorist targets. The system is being designed to provide output couched in terminology familiar to each qualified user and framed within the value system and world view of each user. 18 figures.