Data flow diagram

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Wonderful Chicken Wings restaurant wants to automate its system to order chicken wings for delivery through a phone. When customers call Wonderful Chicken Wings on the phone, they are asked their phone number. When the number is typed into a computer and if this is a regular customer then the name, address, and last order date is automatically brought up on the screen. However, if this is a new customer then they will be asked for their name and address and then a new customer record is created. The order will then be taken and the total plus tax is calculated.

The order will be given to the restaurant chef for cooking and a receipt will be printed. A delivery person picks up and give customers their order and a copy of the receipt. The system also reports weekly totals to the company management for comparison with last year’s performance.

a). Draw a context-level data flow diagram for the “Wonderful Chicken Wings Order” system.

b). Explode the above context-level diagram by drawing the logical data flow diagram level 0 showing all the major processes.

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