Figure 1a shows a spreadsheet containing information about a small warehouse for a bar/coffee shop distribution. On the top half (rows 1 through 6), we have three classes: Product, Client, and Order. Product (cell range A3:B5 and J3:K5) contains a product ID, its Name, Unit Price, and amount in Stock, while expanding vertically (indicated by the ellipsis on row 5). Client (cell range C1:G2) contains the client’s Name, along with his/her Address, City, and Country, and expands horizontally (indicated by the ellipsis on column I). The Order (cell range C3:H5) is a relationship class which arises due to the joining of a Product and a Client. This class contains a Quantity value of the product, an Order Date, a product Category,aSold Price formula to calculate the price, and the warehouse’s ToSellprice (expected price) for selling all of that product.