CartGT's product catalog design (schema) is not like most of the other shopping cart applications. CartGT uses Departments rather than Categories as the fundamental building block for the product catalog. Each category and brand has too belong to a specific Department. This makes more sense to most retailers when setting up their product catalog, rather than having to create a long list of categories and sub-categories. This also allows the CartGT product catalog to be setup just like the departments in most retail stores. Having everything in separate departments makes it easier for the shoppers to navigate your product catalog and it makes it easier for the web site administrator to manage the products in the digital catalog. See the diagram below for a visual of how the CartGT shopping site is designed.