All terrorist groups eventually end. But how do they end? The evidence since 1968 indicates that most groups have ended because (1) they joined the political process (43 percent) or (2) local police and intelligence agencies arrested or killed key members (40 percent). Military force has rarely been the primary reason for the end of terrorist groups, and few groups within this time frame have achieved victory. This has significant implications for dealing with al Qa'ida and suggests fundamentally rethinking post-9/11 U.S. counterterrorism strategy: Policymakers need to understand where to prioritize their efforts with limited resources and attention. The authors report that religious terrorist groups take longer to eliminate than other groups and rarely achieve their objectives. The largest groups achieve their goals more often and last longer than the smallest ones do. Finally, groups from upper-income countries are more likely to be left-wing or nationalist and less likely to have religion as their motivation. The authors conclude that policing and intelligence, rather than military force, should form the backbone of U.S. efforts against al Qa'ida. And U.S. policymakers should end the use of the phrase “war on terrorism” since there is no battlefield solution to defeating al Qa'ida.

This research in the public interest was supported by RAND, using discretionary funds made possible by the generosity of RAND's donors, the fees earned on client-funded research, and independent research and development (IR&D) funds provided by the Department of Defense.

This report is part of the RAND Corporation monograph series. RAND monographs present major research findings that address the challenges facing the public and private sectors. All RAND monographs undergo rigorous peer review to ensure high standards for research quality and objectivity.

Permission is given to duplicate this electronic document for personal use only, as long as it is unaltered and complete. Copies may not be duplicated for commercial purposes. Unauthorized posting of RAND PDFs to a non-RAND Web site is prohibited. RAND PDFs are protected under copyright law. For information on reprint and linking permissions, please visit the RAND Permissions page.

The RAND Corporation is a nonprofit institution that helps improve policy and decisionmaking through research and analysis. RAND's publications do not necessarily reflect the opinions of its research clients and sponsors.