Evergreen Nurseries

Evergreen Nurseries offers a wide range of lawn and garden products to its customers. Evergreen Nurseries conducts both whole- sale and retail operations. Although the company serves as a wholesaler to nurseries all over the United States, the company's founder and president has restricted its retail operations to California, the company's home state. The company is situated on 150 acres and wholesales its bulbs, perennials, roses, trees, shrubs, and Evergreen Accessory prod- ucts. Evergreen Accessory products include a variety of fertilizers, plant foods, pesticides, and gardening supplies.

In the past five years, the company has seen a phenomenal sales growth. Unfortunately, its information systems have been left behind. Although many of Evergreen Nurser- ies's processing activities are computerized, these activities require reengineering. You are part of the project team hired by Seymour Davis, the company's president, to renovate its wholesale division. Your project team was hired to renovate the billing, order taking, and inventory control systems.

From requirements determination, you dis- covered the following. An Evergreen Nurs- eries customer places a call to the nursery. A sales representative takes the order, veri- fies the customer's credit standing, deter- mines whether the items are in stock, notifies the customer of the product's status, informs the customer if any special discounts are in effect, and communicates the total payment due. Once an order is entered into the sys- tem, the customer's account is updated, prod- uct inventory is adjusted, and ordered items are pulled from stock. Ordered items are then packed and shipped to the customer. Once each month, a billing statement is generated and sent to the customer. The customer has thirty days to remit payment in full; otherwise, a 15 percent penalty is applied to the customer's account.

a. Construct a context data-flow diagram, illustrating Evergreen Nurseries's whole- sale system.

b. Construct a level-0 diagram for Evergreen Nurseries's wholesale system.

c. Using the level-0 diagram that you con- structed in part b, select one of the level-0 processes and prepare a level-1 diagram.

d. Exchange your diagrams with those of an- other class member. Ask your classmate to review your diagrams for complete- ness and consistency. What errors did he or she find? Correct these errors.