In this book, John Arthur and Louise Moody introduce the concept of the reasoning chain, a new approach to risk-based reasoning systems in large, complex and distributed organisations. Arguing that large, complex and distributed organisations are particularly focussed on a triple-helix of chain metaphors – supply, value and reputation chains – the authors propose that there is overwhelming evidence that the accepted approaches to risk and resilience do not compliment this architecture. This is extremely problematic because risk and resilience constructs have been formally and informally regulated for these industries. The Reasoning Chain proposes and illustrates a holistic solution to the problems thrown up by existing norms. It is proposed that the reasoning chain be intentionally designed on an equal footing with supply, value and reputation; a quadruple helix. Through challenge of best practice, an argument unfolds to outline the novel approach for risk based resilience reasoning in large distributed organisations, illustrated through a series of case studies and guidance to implementation. This book is an accessible and valuable resource for risk managers and decision makers responsible for complex business decisions.