Numbering the Events (Fulkerson’s Rule)
1. The initial event which has all outgoing arrows with no incoming arrow is numbered “1”.
2. Delete all the arrows coming out from node “1”. This will convert some more nodes into initial events. Number these events as 2, 3, 4, ….
3. Delete all the arrows going out from these numberedevents to create more initial events. Assign the next numbers to these events.
4. Continue until the final or terminal node, which has all arrows coming in with no arrow going out is numbered.