Good biosecurity policy decisions, particularly in relation to plant industry protection, is of ever increasing importance. Growth in the speed and diversity of trade, the effects of climate change and the resultant spread of pests and diseases continue to highlight this. This book contains an introduction to the issues confronting plant biosecurity policymakers and how the economic risks of invasive species can be assessed over time. It introduces a generic bio-economic model, around which an impact-evaluation framework is constructed and demonstrated. Based on the findings of case studies,...