Identifies limits of the system. Definition of boundary relates directly to system’s purpose.
Inside boundary are elements/components that make up system and are within system’s control.
Outside boundary is environment and the elements/components that are outside of the system’s control.
Elements/components both inside and outside boundary can be used as system inputs and can also be influenced by it’s outputs.
Analysing a system.

  • Rough definition of system
  • Draw an ellipse – the boundary
  • Populate with what we think belongs inside boundary
  • Add what we think belongs in the environment
  • Ask “Does it make sense?”
  • If not, refine diagram until adequate representation of system is deteremined





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