Valuing nature with travel cost models : a manual The book presents a self contained treatment of TCM along with a wide range of applications to natural resource and environmental policy questions 1. Support for environmental policy decisions 2. History and scope of TCM 3. Demand theory and TCM 4. Benefits theory and TCM 5. Design principles for TCMs 6. Design and administration of surveys 7. Measurement of the variables 8. Data management and analysis 9. Developing and maintaining expertise