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What is the difference between activity on node and activity on arrow?

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In project scheduling, how is an activity on node different from an activity on arrow? Please explain all the differences between the two.
asked 3 years ago by anonymous

1 Answer

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Activity-on-Node and Activity-on-Arrow diagrams are two different ways of showing a project schedule network.

With Activity-on-Arrow or AOA schedule diagrams, the activity occurs along the arrow.  As a result, you are constrained to showing only finish-to-start relationships.  As a result, dummy nodes had to be added in order to show more complex relationships.

If you place the activities on the nodes as with Activity-on-Node (AON) diagrams, now the arrows can go in any direction and you can represent the full range of dependencies: start-to-finish, finish-to-start, start-to-start, and finish-to-finish.

In general, because of the serious constraint, Activity-on-Arrow diagrams are now rarely used.
answered 3 years ago by sdcapmp (45,840 points)

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