. Consider the following narrative: XYZ Supermarket, a chain of grocery stores, is building a web site to allow customers to place orders for groceries and other items they sell. Users of the web site should have a valid username/password in order to use the system; if they are using the system for the first time, they should be registered. Users of the web site will be able to see the list of products, add selected items to basket, and pay for the products they have selected. When placing the order, after the products are selected, then they will enter a shipping and a billing address (or select from the list of already recorded addresses if there is any), select payment type (credit card or money transfer) and make the payment. Users will also be able to track the status of their undelivered orders, list the old orders they have made, and will be able to update or cancel their order(s) if they have not been shipped yet. a. Draw a context-level DFD. (5 points) b. Draw a level 0 DFD. (10 points) c. Draw a level 1 DFD for one of the processes you have shown in level 0. (10 points)

2. Consider the following narrative: XYZ Supermarket, a chain of grocery stores, is building a web site to allow customers to place orders for groceries and other items they sell. Users of the web site should have a valid username/password in order to use the system; if they are using the system for the first time, they should be registered. Users of the web site will be able to see the list of products, add selected items to basket, and pay for the products they have selected. When placing the order, after the products are selected, then they will enter a shipping and a billing address (or select from the list of already recorded addresses if there is any), select payment type (credit card or money transfer) and make the payment. Users will also be able to track the status of their undelivered orders, list the old orders they have made, and will be able to update or cancel their order(s) if they have not been shipped yet. a. Draw a context-level DFD. (5 points) b. Draw a level 0 DFD. (10 points) c. Draw a level 1 DFD for one of the processes you have shown in level 0. (10 points)