Details quantified risk assessment and considers, through case studies, how accident causation can be considered from the three main perspectives of hardware failure, human error and failures of systems and cultures. Also addresses the current debate concerning risk issues and the nature of risk; mainly from the perspective of the chemical and process industries by looking at the process of risk assessment, its strengths and weaknesses and attempts to reconcile the human dimensions of risk assessment with the need for science and objectivity in risk-based decision making. Each chapter provides diagrams, summary and discussion sections.