This book contains the proceedings of the sixth in a series of interdisciplinary conferences on safety and security engineering. The papers from the biennial conference, first held in 2005, include the work of engineers, scientists, field researchers, managers and other specialists involved in one or more aspects of safety and security.The papers presented cover areas such as: Risk Analysis, Assessment and Management; Critical Infrastructure Protection; Emergency Response; Security Surveillance Systems; Safety and Security - Water, Wastewater and Waste Plants; Human Factors; Modelling and Experiments; Systems Safety.