Data Flow Diagram

[Level 1 Data Flow Diagram -] this highlights the main functions carried out by the system. As a rule, we try to describe the system using between two and seven functions. SQA

What is a data flow diagram (DFD)?

Data flow diagrams or DFDs help the analysis of systems by showing:
  • Data sources
  • What processing happens and by whom
  • Who uses the data
  • Where data is stored and when
  • Outputs produced
Representing the complete business system often requires multiple levels of diagram.

The top level, is referred to Level 0 or the Context Diagram, it represents the system as one process box. Level 1 data flow diagrams show incoming data flow, processes and output data flows.
Level 1 DFDs should show a process to handle each incoming data flow and a process to generate each output data flow.

Example Data Flow Diagrams

This example of a level 1 data flow diagrams is free to copy, download and use.

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Data Flow Diagram - example

Other example data flow diagrams

DFD1
https://commons.wikimedia.org/wiki/File%3ADFD1.png

Level1
https://commons.wikimedia.org/wiki/File%3ALevel1.gif

Data Flow Diagram - references

http://whatsupnew.com/wp-content/uploads/image3.gif

SQA http://www.sqa.org.uk/e-learning/SDM03CD/page_12.htm

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