1. Data Flow Diagramming Solutions to In-Class Exercises

2. 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.

3. Precision Tools Context Diagram

4. Precision Tools Level-0 Diagram

5. 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