discussion question DFD DIAGRAM

Question

1. 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.

Your DFDs for this assignment should be drawn using the Gane-Sarson DFD symbols. 

Your Data Flow Diagrams posted for this discussion are NOT to be submitted as attachments that everyone would have to open to read. 

Here are some guidelines to use while writing your DFDs for this discussion.

Guidelines for Discussion No 5 – Wonderful Chicken Wings

 DFD Context Diagram

 There is only one process symbol and it is titled the name of the system. 

 All the data flows are to be into and out of the system to the External Entities to the one process symbol.

 Each data flow includes a name for the data that is flowing to and from the process symbol.  The name of the data flow is to be a noun.

 DFD Diagram Level 0

 This DFD is to include the same External Entities – no more and no less than was on the Context DFD

 Data Flows are to be named using a noun – it is to name the data that is flowing.

 Processes are to be named using verbs – it should describe the process that is being performed.

 Entities should be named using nouns – it is describing the person, etc.

 Data flows to and from processes – data should not flow directly to from one entity to another

  There are no decisions in a DFD