How do you categorize e-commerce sites
The term e-commerce site seems to be used for everything from sites that sell a few e-books on-line with Paypal links to major sites that need shopping carts to organize products by color, and size, and decrement inventory,and need custom code to work with IPN. Has anyone worked out how to categorize the different types of e-commerce sites in order to help streamline bidding on constructing them?