Rules or Guidelines for Drawing Network Diagram

Rules or Guidelines for Drawing Network Diagram:

There are several rules that apply to the handling of events and activities in a project network, and so guidelines for Drawing Network Diagram are as follows:

(a) In the network, each activity is represented by a single arrow.

This means that no single activity can be represented in the network twice. This differs from the case where a single activity is divided into segments. In this case, each segment could be depicted by a different arrow.

(b) The same beginning and end event cannot be used to identify two activities.

In such cases, as shown in Figure, a dummy activity is introduced to solve the problem.

(c) The following question must be checked whenever any activity is added to a network to ensure that the precedence relationship in an arrow diagram is correct.

What activity must be completed first in order for this activity to begin?
What activities must follow this activity?
What activities must occur simultaneously with this activity?

Suggestions:

1. Avoid arrows that cross each other.

2. Use straight arrows.

3. Use arrows from left to right.

4. The development of a network should be based on logical or technical dependability.

5. The arrows representing various activities are only indicative of logical precedence; thus, the length and direction of the arrows are unimportant.

6. Two events are numbered in such a way that the event with the higher number can occur only after the event with the lower number has finished.

7. In the rough graph, you can use dummy activity as much as you want, but the final network should only have reluctant dummies.

8. The network has only one point of entry, known as the start event, and one point of emergence, known as the end event.

9. The angle formed by the arrows should be as large as possible.

(Source – Various books of college library)

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