Inventory Management provides a unique overview of inventory models, from single-item single-echelon models to multi-item multi-echelon models. Rather than starting with inventory models that are tractable from a mathematical point of view, the author starts from the inventory management problem and the modeling challenges to be faced. The first section of this monograph is devoted to modelling inventory systems. The second section discusses single-item single-echelon models. The third section extensively discusses multi-item multi-echelon inventory systems. The fourth section briefly discusses the additional issues that come with taking into account resource constraints.