Precedence Diagramming Method (PDM)

precedence diagramming method pdm activity on node aon diagram

Before moving any further in this article, let’s get this off the chest – Precedence Diagramming Method (PDM) is also known as Activity On Node (AON). They are the same thing! There is another form of diagramming known as Activity On Arrows (AOA).

From the article on the Sequence Activities Process, we already noted that the main aim of the process is to identify and document relationships among the project activities. One way to visualize how activities relate to each other is to create a Network Diagram using the Precedence Diagramming Method.

In this method, the nodes represent the activities and arrows represent dependencies or relationships.

precedence diagramming method

You can simply put it this way – The Precedence Diagramming Method shows activities in rectangles and their relationships (predecessor or successor) as arrows. Below is a simple example of how to draw a network diagram using the Precedence Diagramming Method. For step by step explanation do refer to the video

precedence diagramming method practice

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