Suppose you sell yachts for a small yacht broker. Your company specializes in selling yachts in the $150,000 to $500,000 range. You are the regional dealer for a manufacturer of yachts in this category, and you also sell used boats. Although the management of the company has stated that customers are to be assigned to particular salespeople, you know that this arrangement is fluid, and sometimes it is not clear either to the salespeople or the customers which customer is assigned to which salesperson. Furthermore, you would like to maintain a database of customer boat preferences (make, model, length) so that when the brokerage takes a listing on a new boat, you can query a database of your customers to determine who might be interested in that new listing.