Network Diagram

Network diagram is primarily used to understand how the activities in a project is sequenced, understand the dependencies between activities and finally to understand the critical path in the project.

On the very simple terms, network diagram shows how the activities related to each other.

Meaning that in your project once you identify the activities and the order in which the activities needs to perform, you can represent this information in the form of network diagram.

ACTIVITY ON NODE AND ACTIVITY ON ARROW DIAGRAM EXAMPLE

Following example project require the following activities to perform in the project.

CREATING NETWORK DIAGRAM USING ACTIVITY ON ARROW (AOA) OR ACTIVITY DIAGRAMMING METHOD (ADM)

If you see in this activity on arrow (AOA) diagram, a dummy activity is there to show the dependency between activity A and activity D.

CREATING NETWORK DIAGRAM USING ACTIVITY ON NODE (AON) OR PRECEDENCE DIAGRAMMING METHOD (PDM)

In the above activity on node or precedence diagramming method, you can see the simplicity of the network diagram using PDM when compare to activity on arrow diagrams.

Network diagram is to represent the Order of the activities in the project, Dependencies between the activities, And to show the duration of the project activities, finally to determine the critical path in the project and to analyze the activities on the critical path.