Creating structural business rules at the outset will help guide the design throughout the rest of the sections. An example of this type of business rule not related to Amazon is A car may be driven by many drivers; each driver drives one or more cars. Each business rule should describe the entities involved, the relationship between the entities, and the optionality and plurality constraints for each entity. Try to make sure that you have created all the structural business rules required for each use case.

Use Case 2 Amazon Receipt of Product from Seller

This occurs when a seller sends one or more units of a product to Amazon so that they can be sold:

1. The seller ships one or more units of a product to Amazons warehouse, along with information that indicates to Amazon what the product is, how many units there are, and the condition (new, used, etc ).
2. After Amazon receives the product(s), it updates the sellers electronic inventory so that consumers can purchase the product.