ch. 1. Introduction and objectives / A. Hart. [et al.] -- ch. 2. Problem formulation for probabilistic ecological risk assessments / A. Hart. [et al.] -- ch. 3. Issues underlying the selection of distributions / D. Farrar. [et al.] -- ch. 4. Monte Carlo, Bayesian Monte Carlo, and first-order error analysis / W.J. Warren-Hicks. [et al.] -- ch. 5. The Bayesian vantage for dealing with uncertainty / D.A. Evans. [et al.] -- ch. 6. Bounding uncertainty analyses / S. Ferson. [et al.] -- ch. 7. Uncertainty analysis using classical and Bayesian hierarchical models / D.R.J. Moore. [et al.] -- ch. 8. Interpreting and communicating risk and uncertainty for decision making / J.L. Shaw. [et al.] -- ch. 9. How to detect and avoid pitfalls, traps, and swindles / G. Joermann. [et al.] -- ch. 10. Conclusions / A. Hart. [et al.].