Shippers Drug Stores (SDS), which consists of a chain of retail stores across Canada, wants to be able to provide a new online customer service system. Each store has an identifying store no, an address, phone and email. The company dispenses a wide range of pharmaceutical (drug) products. Each product has a name as well as a unique DIN (Drug Identifying Number). Each store keeps its own inventory record which maintains information on the quantity of each product that is on hand as well as its reorder level and reorder quantity