DFDs

DFD

There are four components for a Data Flow Diagram. They are

  • External Entities/ Terminators are outside of the system being modeled.

They represent where information comes from and where it goes. These

are represented by rectangles.

  • Processes, usually represented by an ellipse (circle), which modify the

input to generate the output.

  • Data Stores represents a place in the process where data rests. This is

represented by an open-ended rectangles or a cylinder symbol.

  • Data Flows, represented by arrows, are how data moves between

terminators, processes, and data stores

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