<P>This textbook analyses the origins and effects of insider risk, using multiple real-life case histories to illustrate the principles, and explains how to protect organisations against the risk.</P><P>Some of the most problematic risks confronting businesses and organisations of all types stem from the actions of insiders ¿ individuals who betray trust by behaving in potentially harmful ways. Insiders cause material damage to their employers and society, and psychological harm to the colleagues and friends they betray. Even so, many organisations do not have a systematic understanding of the nature and origins of insider risk, and relatively few have a coherent and effective system of protective security measures to defend themselves against that risk. This book describes the environmental and psychological factors that predispose some individuals to become harmful insiders, and the most common pathways by which this happens. It considers how aspects of insider risk have been al