This book is necessary for research scholars in the field of inventory management. It is about understanding business realities and making decisions for management. In this book, I describe neatly about fundamantal of inventory. In chapter-2, a review of a model, "The Inventory Model for Deteriorating items with Triangular type Demand Rate" has been presented. The model is to investigate the inventory system for perishable items with price dependent demand pattern where Weibull deterioration rate is considered. The Economic Order Quantity is determined for maximizing the profit per unit time. In chapter-3, we have discussed, "Modeling for Inventory with Exponential Declining Demand, variable Deterioration, Linear Holding Cost and Inflation without Shortages".