Part 1: Getting Started. 1. Setting Up DEFINITE. 2. Tutorial. Part 2: Reference Manual 3. Procedures of the Main Menu and Utilities. 4. Problem Definition Procedures. 5. Problem Presentation Procedures. 6. Problem Evaluation Procedures. 7. Sensitivity Analysis Procedures. 8. Report Generation. Part 3: Examples from the Practice of Environmental Decision Making. 9. Introduction to the Examples. 10. The Forest and Timber Inquiry in Australia. 11. Soil Conservation in Maphutseng, Lesotho. 12. Environmental Effects of Electricity Production in the Netherlands. 13. Siting Nuclear Plants in the Netherlands. Appendix: Technical Manual.