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Software Design Center
HOW TO DRAW DATA FLOW DIAGRAMS
What are Data Flow Diagrams?
Data flow diagrams illustrate how data is processed by a system in terms of inputs and outputs.
A data flow diagram
Data Flow Diagram Notations
You can use two different types of notations on your data flow diagrams: Yourdon & Coad or Gane & Sarson.
Yourdon and Coad
Process Notations
Gane and Sarson
Process Notation
Process
A process transforms incoming data flow into outgoing data flow.
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Yourdon and Coad
Datastore Notations
Gane and Sarson
Datastore Notations
DataStore
Datastores are repositories of data in the system. They are sometimes also referred to as files.
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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
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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