A data flow diagram (DFD) is used to show how the data flows through a program. It is used during the design phase to figure out how to get data from its source through all the processing and to its final destination or disposal. It is used later for reference like other design documents are used.
An early equivalent of the data flow diagram was used on Unit Record Punchcard electromechanical data processing machines to show the flow of the decks of cards from machine to machine. The operators referenced these diagrams to make sure they knew where to take each deck of cards next.
A similar diagram called a workflow diagram was developed in the 1920s to show the flow of work through a business or factory.
DFD stands for data flow diagram and is also known as bubble chart.DFD shows data in motion between different processes, process and store or external agent.
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A Physical Data Flow Diagram is a diagram showing howparticular functions are performed within the data flow as opposed to a Logical DFD which only shows what functions are performed.
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Each airline may have a slightly different diagram available. You can do an image search online to find the diagram that you want.
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Data Flow Diagram or DFD is made to give an idea as to how a particular process will flow.
The purpose of a data flow diagram is to show you how the data flows through an information system. A sequence diagram shows you information regarding how the processes work together and in what order they operate.
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