0. Background:

   Kims Flower Inc. is operated by Kim Burke, the Chief Executive Officer (CEO), and her associated employees. She has decided to develop a database system to track her purchases, floral inventory, accounts payable, and cash payments. However, she does not have time to do the development herself. Therefore, she has hired you and your team members to design and implement the system (i.e., flower purchasing system) for her. She describes the requirements of her system as follows:

   Whenever flowers are needed, a purchasing clerk prepares a purchase order by completing a purchase order form. The purchase order form includes purchase order number, order date, item number, quantity ordered, order price, employee number (preparer), employee number (authorizer), and vendor number. To accommodate all of floral needs, the purchasing clerk may need to prepare several purchase orders, as Kims Flower Inc. orders flowers from several vendors. Also, a purchase order can be made for several types of flowers from a single vendor. When the purchase order form is prepared, the purchasing clerk forwards the form to the CEO, Kim Burke, who approves the order. The approved purchase order then sends to a vendor.

   When the order is received, a warehouse department clerk inspects the quality of flowers and verifies the quantity of flowers based on the purchase order and the packing slip included in the shipment. The clerk then prepares a receiving report, forwards the report to an accounting payable clerk for payment process, and updates inventory records. The receiving report includes receipt number, receipt date, quantity received, item condition, purchase order number, employee number (receiver), and vendor number. Also, an invoice is delivered to the accounts payable clerk from the vendor.

   At the end of each month, the accounts payable clerk prepare an purchase order payment form for all amounts charged through the end of the month by verifying invoices, purchase orders, and receiving reports. The purchase order payment form includes payment number, payment date, payment amount, employee number (preparer), employee number (authorizer), receipt number, vendor number, and account number. The form is then forwarded to the CEO. When the CEO authorizes the payment form, the accounts payable clerk prepares a check and mails it to the vendor. Finally, a monthly summary report of purchase orders and payments is prepared for each month and forwarded to the CEO.

1. For Level 0 Data Flow diagram, there are four activities: 1.0 Receive purchase order, 2.0 Receive order, 3.0 Make payment, and 4.0 Generate report.