The Nexus Approach is increasingly evolving into an integrative concept which bridges sectors and considers interrelated resources in an unbiased way to achieve sustainable resources management. Nexus-oriented resources management is thus imperative for achieving the United Nations Sustainable Development Goals (SDGs). The other way around, a resource perspective on the nexus should be helpful given that virtually all SDGs imply and rely on sustainable resources management, in particular addressing water, soil, and waste. The interrelatedness of SDGs provides another strong case for a Nexus Approach. Here we briefly lay out the background and conceptual outline of the book, addressing key aspects of nexus implementation including monitoring of resource use, closing cycles of key elements, utilize proven methods of stakeholder participation and its mapping and monitoring and mainstreaming of thresholds and policies across scales and governmental levels. We then summarise these key aspects addressed in subsequent chapters and highlight the interrelations. Overall, this volume provides a strong case for strengthened monitoring frameworks and for close involvement of all stakeholders in the process of implementing a Nexus Approach. It adds to the ongoing process of consolidation and diversification of the Nexus Approach and provides specific recommendations of how to advance it.