How to Draw Arrow Diagramming Method (ADM)

• In the Arrow Diagramming Method (ADM), activities are represented by arrows, and nodes (circles or boxes) represent events (start or finish points). Also called Activity-on-Arrow (AOA) network diagrams.

• The start and end of each node or event are connected to an arrow. Between the two nodes lies an arrow that represents the activity. Nodes or circles are the starting and ending points of activities.

• Each arrow shows a task, and the connection points (nodes) represent the precedence relationships.

• Dummy activities (dashed arrows) are sometimes used to show logical relationships that don't require time.

• Can only show finish-to-start dependencies.

Single Activity on AOA network diagram

Connection of Two Activities

Examples of different dependencies

Dummy activity

Zero duration, consumes no resources, drawn as dashed lines, and used to adjust the network diagram

Example 1

Introduction to Network Diagram (Activity on Arrow)

Draw Arrow Diagram Method