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hw we design DFD and Table hw we draw dfd for bus reservation system plse send a model
A data flow diagram (DFD) is a graphical representation of the "flow" of data through an information system, modeling its process aspects. Often they are a preliminary step used to create an overview of the system which can later be elaborated.[2] DFDs can also be used for the visualization of data processing (structured design).

A DFD shows what kinds of information will be input to and output from the system, where the data will come from and go to, and where the data will be stored. It does not show information about the timing of processes, or information about whether processes will operate in sequence or in parallel (which is shown on a flowchart.

A data flow diagram can look as follows:



Creating a Data Flow Diagram

You create a data flow diagram from the business process diagram with the Data Flow Diagram process language attached.

Select File > New Model, and choose to create a business process model from the Model type list.
Select Business Process Diagram as the first diagram.
Select Data Flow Diagram from the Process language list and click OK.


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