Weaver Pizza wants to install a system to record orders for pizza and chicken wings. When regular customers call Weaver Pizza on the phone, they are asked their phone number. When the number is typed into a computer, the name, address, and last order date is automatically brought up on the screen. Once the order is taken, the total, including tax and delivery, is calculated. Then the order is given to the cook. A receipt is printed. Occasionally, special offers (coupons) are printed so the customer can get a discount. Drivers who make deliveries give customers a copy of the receipt and a coupon (if any). Weekly totals are kept for comparison with last year's performance. A summary of the business activities for Weaver Pizza is:

- Display customer record. Input is the customer number and the customer record. Output is customer information.

- Take customer order. Input is the order information (including the customer number). Output is the total amount due for the order.

- Send order to cook. Input is the customer order. Output is the cook's order.

- Print customer receipt. Input is the customer order and the customer master record. Output is the customer receipt.

- Deliver customer order. Input is the customer receipt and coupons. Output is the delivered receipt to the customer.

- Print weekly totals. Input is the customer order and the previous year's customer order summary. Output is the weekly performance figures.

a) Draw a context-level data flow diagram for Weaver Pizza.

b) Explode the context-level diagram to show all the major processes. Call this Diagram 0. It should be a logical data flow diagram.