PERT and CPM - 3 - For Beginners - Basics - 3 - Rules to draw PERT Chart
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Rules for Drawing Network Diagram
Rule 1
Each activity is represented by one and only one arrow in the network
Rule 2
No two activities can be identified by the same end events
Rule 3
In order to ensure the correct precedence relationship in the arrow diagram, following questions must be checked whenever any activity is added to the network
What activity must be completed immediately before this activity can start?
What activities must follow this activity?
What activities must occur simultaneously with this activity?
In case of large network, it is essential that certain good habits be practiced to draw an easy to follow network
Try to avoid arrows which cross each other
Use straight arrows
Do not attempt to represent duration of activity by its arrow length
Use arrows from left to right. Avoid mixing two directions, vertical and standing arrows may be used if necessary.
Use dummies freely in rough draft but final network should not have any redundant dummies.
The network has only one entry point called start event and one point of emergence called the end event.
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