It is essential for large businesses who deal with many customers to employ inventory control that compliments well that company's requirements for swift and rapid fulfillment services. Successful inventory control requires a multi-level supervision of company areas such as the supply available, the storage of products, and the easy accessibility of those products or items. Inventory control requires a balance of supply versus demand and it is the responsibility of the inventory control specialist to make sure a great excess of product does not occur since oversupply can cause difficulties for the proper storage of a company's offerings.