Introduction: Meeting and Managing the ThreatAudrey Kurth Cronin Part I: The Nature of Terrorism 1. Sources of Contemporary TerrorismAudrey Kurth Cronin 2. The Four Waves of Modern TerrorismDavid C. Rapoport 3. Terrorism, Strategies, and Grand StrategiesMartha Crenshaw Part II: Policy Instruments in the Campaign Against International Terrorism 4. DiplomacyMichael A. Sheehan 5. IntelligencePaul R. Pillar 6. Law EnforcementLindsay Clutterbuck 7. Military ForceTimothy D. Hoyt 8. The Laws of WarAdam Roberts 9. Psychological-Political InstrumentsCarnes Lord 10. Foreign AidPatrick M. Cronin 11. Homeland SecurityDaniel Goure Conclusion: Toward an Effective Grand StrategyAudrey Kurth Cronin