Buffer Stock, also known as Safety Stock, and Reorder Level (ROL) are two important concepts in Inventory and Stores Management. Although both are related to maintaining adequate inventory and avoiding stock-outs, they serve different purposes and are determined differently. Buffer Stock or Safety Stock refers to the additional quantity of inventory kept above the expected requirement to protect against uncertainties in demand and supply. It acts as a reserve that can be used when actual demand is higher than anticipated, when deliveries are delayed, or when other uncertainties occur. For example, if a store normally requires 100 units during the expected supply lead time, it may maintain an additional 20 units as safety stock. Thus, safety stock provides protection against unexpected fluctuations and helps ensure continuous production and sales operations. The level of safety stock depends on factors such as demand variability, supply reliability, lead time uncertainty, desired service level, and the cost of holding inventory. The Reorder Level (ROL), or Reorder Point, is the inventory level at which a new order should be placed so that fresh stock arrives before the existing inventory is exhausted. It is therefore an ordering trigger rather than merely a reserve quantity. Under stable conditions, the reorder level is generally calculated as: Reorder Level