The Customer and Order classes are the same as we described in earlier pages. You may skip to the new material here.

The Customer class represents any person who has done business with us or who we think might do business with us in the future. Its attributes are:

• Customer first name.
• Customer last name.
• Customer phone.
• Customer street.
• Customer zip code.

The Order class represents an event that happens when a customer decides to buy one or more of our products. Its attributes are:

• Order date.
• Sold by, which identifies the sales person.
• Total, which can be computed from other attributes in the model.

The association between customer and order classes is:

• Each customer places zero or more orders.
• Each order is placed by one and only one customer.

The Product class represents a specific type of item that we have for sale. Its attributes are:

• Uniform Product Code, or UPC.
• Product name.
• Manufacturer.
• Model.
• Unit list price.
• Units in stock.

The association between order and product classes is:

• Each order contains one or more products.
• Each product is contained in zero or more orders.

Attributes of the association between the order and product are contained in an association class, Order Line. These attributes are:

• Quantity.
• Unit sale price
• Subtotal, which can be computed from other attributes in the model.

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