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

In project scheduling, how is an activity on node different from an activity on arrow? Please explain all the differences between the two.
asked 4 years ago by anonymous

1 Answer

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 4 years ago by sdcapmp (45,840 points)

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