This book presents current theory and research on the way that psychological factors affect the presentation, diagnosis, and course of illness when causality is at issue. It offers an overview of the crucial scientific knowledge base and the appropriate, comprehensive assessment procedures to be followed in order to arrive at a proper determination for court or other related purposes. It posits and explores three primary factors that determine causality of psychological outcome: pre-stressor psychological vulnerabilities, the specified stressor, and post-stressor factors. Sections are disorder specific and separate chapters explore the facets mentioned.