# What is a Network Diagram.docx - What is a Network Diagram...

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What is a Network Diagram?
Types of Network DiagramsThere are basically two types of network diagrams that are used in developing a schedule. 1.Arrow Network or AoA (Activity on Arrow) or ADM (Arrow Diagramming Method)2.Node Network or AoN (Activity or Node) or PDM (Precedence Diagramming Method)1) Arrow Network or ADM (Arrow Diagramming Method)ADM (Arrow diagramming method)is type of network diagram in which activities are represented by arrows, which are connected to each other through nodes. Tail of the arrow represents start of the activity and head of the arrow represents finish of the activity. Length of the arrow is often proportioned to the duration of the activity. Arrow network only shows finish to start or ‘FS’ relationship between activities.An activity originates and ends at a node. Nodes are used to represent start or end of an activity in a sequence. Starting node of an activity is also referred as activity’s i-node. And ending node of an activity is also referred asactivity’s j-node. This method is also known as I-J method of diagramming.Relationship between activities often needs a dummy activityto correctly represent them. A dummy activity has no duration. It is only introduced to establish complex relationships between activities which cannot be