Data Flow Diagram Notations
You can use two different types of notations on your data flow diagrams: Yourdon & Coad or Gane & Sarson.
Process Notations
Process
A process transforms incoming data flow into outgoing data flow.
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Yourdon and Coad Process Notations
Gane and Sarson Process Notation
Datastore Notations
DataStore
Datastores are repositories of data in the system. They are sometimes also referred to as files.
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Yourdon and Coad Datastore Notations
Gane and Sarson Datastore Notations
Dataflow Notations
Dataflow
Dataflows are pipelines through which packets of information flow. Label the arrows with the name of the data that moves through it.
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External Entity Notations
External Entity
External entities are objects outside the system, with which the system communicates. External entities are sources and destinations of the system's inputs and outputs.
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