1. Introduction, Brecht Volders and Tom Sauer 2. The nuclear threat: a two-level analytical framework to assess the likelihood of nuclear terrorism, Brecht Volders 3. Internal dynamics of a terrorist entity acquiring biological and chemical weapons, Jean Pascal ZandersPART I: Preventing Radiological Terrorism 4. Promoting alternatives to high-risk radiological sources, Miles Pomper and Aaron Gluck 5. Time for a convention on radiological security?, Sylvain Fanielle and Piotr Andrzejewski 6. The threat of a self-sustained chain reaction device, Ivan Andryushin, Eugeny Varseev and Gennady PshakinPART II: Preventing Attacks on Nuclear Facilities 7. Attacking nuclear facilities: hype or genuine threat?, Gary Ackerman and James Halverson 8. Nuclear security in Belgium: evolution and prospects, Rony Dresselaers and Sylvain FaniellePART III: Preventing the Detonation of a Crude Nuclear Device 9. Searching for the nuclear silk road, Steve Sin and Marcus Boyd 10. Securing Pakistan’s nuclear arsenal: the threat from within, Pervez Hoodbhoy and Zia MianPART IV: Nuclear Security Governance and Culture 11. Nuclear security culture: from concept to practice, Igor Khripunov 12. Nuclear security commitment making: results of the summit process, Michelle Cann 13. Nuclear security diplomacy beyond summitry, Trevor Findlay 14. Conclusion, Tom Sauer and Brecht Volders