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Data Flow Diagram (DFD)

DFD has entities and data flows, DFD specifies processing performed by some of the entities. It specifies which entities generate documents and also indicate their flow. Data stores which are referred while processing data and in which processed data may be written or stored are also represented in the Diagram.


  • Entities are, originators of data and “consumers” of data
  • Vendor, Inspection office and purchase office are entities in the diagram
  • Data flows are delivery note, items received note and discrepancy note
  • A circle is used to depict a process
  • A pair of parallel lines depict a store

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