1. Introduction: Risk analysis and society: an interdisciplinary characterization of the field Timothy L. McDaniels and Mitchell J. Small; Part I. Fundamental Character of Risk: 2. The conception of variability in risk analyses: developments since 1980 Dale Hattis; 3. Mechanistic considerations in the harmonization of dose-response methodology: the role of redundancy at different levels of biological organization Lorenz R. Rhomberg; 4. Risk of extreme and rare events: lessons from a selection of approaches Vicki M. Bier, Scott Ferson, Yacov Y. Haimes, James H. Lambert and Mitchell Small; 5. Environmental risk and justice Mary R. English; Part II. Methods for Risk Assessment: 6. Uncertain risk: the role and limits of quantitative assessment Alison C. Cullen and Mitchell J. Small; 7. Valuing risk management choices Robin S. Gregory; 8. The role of efficiency in risk management John D. Graham, Per-Olov Johansson and Junko Nakanishi; Part III. New Approaches and Needs for Risk Management: 9. The challenge of integrating participation and discourse in risk management Ortwin Renn; 10. Global change and transboundary risks Joyce Tait and Ann Bruce; 11. Environmental risks and developing countries: an Asian perspective Michinori Kabuto, Saburo Ikeda and Iwao Uchiyama; Summary and Future Directions: 12. State of the art and new directions in risk assessment and risk management: fundamental issues of measurement and management Rae Zimmerman and Robin Cantor.