PERT and CPM – 3 – For Beginners – Basics – 3 – Rules to draw PERT Chart - Videos

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#Rules to draw PERT Chart

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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