Network diagrams visualise the interrelationships between project activities.

This video illustrates a precedence diagram method for drawing network diagrams.



  1. Read “Creating the Network Diagram” in the prescribed textbook (Web | PDF) (pages 80-82 in PDF version of the text).
  2. Take note of the difference between
    • Activity on Node (AON) or Precedence diagram method (PDM), and
    • Activity on Arrow (AOA) diagrams supported by most project management software tools.
  3. WEnote: In your own words, describe a disadvantage of the AOA method. Post your comment below and then look on the course feed page to see what others have posted..

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