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A data flow diagram maps out the flow of information for a system or process.
The purpose of a data flow diagram is to graphically represent the flow of information for a system.
Data flow diagrams are used by systems analysts and information systems professionals to document how data moves within a system.
Each process should have at least one input and one output; all processes should link to another process or data store; each data store should have at least one data flow in and one data flow out