Data flow diagram
graphical representation of the "flow" of data through an information system
English: A data flow diagram (DFD) is a graphical representation of the flow of data through an information system. A DFD shows the flow of data from data sources and data stores to processes, and from processes to data stores and data sinks. DFDs are used for modelling and analyzing the flow of data in data processing systems, and are usually accompanied by a data dictionary, an entity-relationship model, and a number of process descriptions.
Types of structure edit
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Simple structure
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Iteration
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Manchester architecture
Types of flow edit
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Condition type graph
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if condition
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while loop
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Computation involving several nodes
Building blocks edit
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Switch type node
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Merge type node
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Computational node
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Firing node
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Data flow note
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Notation
Data flow diagram levels edit
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Context level
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Level 0 Data flow diagram for the same system.
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Level 1 Data flow diagram showing the "Process Enquiry" process for the same system.