The emergence of the NBC terrorism debate -- Trends in terrorist activity -- Technical opportunities and constraints -- Strategic and tactical motivations and disincentives to using NBC weapons -- Political disincentives to using NBC weapons -- Political and theological motivations to using NBC weapons -- Psychological motivations and inhibitory controls -- External motivations: state-sponsored NBC terrorism -- External constraints: the security environment created by government counter-measures -- The future -- Appendix: Database of biological, chemical and nuclear terrorist incidents.