Data Flow Diagrams
Data flow diagrams illustrate how data is processed by the system in terms of inputs and outputs.
A Data Flow Diagram (DFD) drawn using the SSADM style
Data Flow Diagram Notations
Process
A process transforms incoming data flow into outgoing data flow.
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Datastore
Datastores are repositories of data in the system. Use an "M" followed by a number to identify manual datastores, and use a "D" followed by a number to identify computer data. If the data is temporary or transient, you can use a "T" to identify it.
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External Entity
External entities are objects outside the system, with which the system communicates. External entities are sources and destinations for the system's inputs and outputs.
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