RULES FOR NETWORK CONSTRUCTION
The following are the primary rules for constructing AOA diagram.
1. The starting event and ending event of an activity are called tail event and head event, respectively.
2. The network should have a unique starting node (tail event).
3. The network should have a unique completion node (head event).
4. No activity should be represented by more than one arc in the network.
5. No two activities should have the same starting node and the same ending node.
6. Dummy activity is an imaginary activity indicating precedence relationship only. Duration of a dummy activity is zero.
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