Data Flow Diagramming Solutions to In-Class Exercises

In-Class Exercise: Precision Tools Precision Tools sells a line of high-quality woodworking tools. When customers place orders on the company’s Web site, the system checks to see if the items are in stock, issues a status message to the customer, and generates a shipping order to the warehouse, which fills the order. When the order is shipped, the customer is billed. The system also produces various reports. 1. Draw a Context Diagram for the order system. 2. Draw a Level-0 DFD for the order system.

Precision Tools Context Diagram

Precision Tools Level-0 Diagram

In-Class Exercise: Evergreen Nurseries Sells plants and gardening supplies wholesale Sales representative takes customer order via phone verifies customer’s credit determines if items are in stock notifies customer of product(s) availability informs customer of special discounts and total cost Order is processed customer account updated product inventory adjusted ordered items pulled from stock and packed order shipped to customer with packing slip Billing monthly billing statement sent to customer customer has 30 days to remit payment Monthly reports produced for manager