Top 8 Guidelines For Constructing OR Network Diagrams

Guidelines for constructing Network Diagrams:

1. Each activity is represented by only one arrow.
2. An arrow can represent only one activity
3. If two or more activities are identified with the same start & end events.  Dummy activity / activities  need to be introduced in the network
4. Before an activity can be started all preceding activities must be completed
5. The flow of diagram is from left to right.
6. The arrows are not to the scale
7. Arrows should be straight
8. Unless absolutely unavoidable, arrows should not be crossed.