An arrow diagramming method (ADM) is a network diagramming technique in which activities are represented by arrows.

It is used for scheduling activities in a project plan

Project plan

A project plan, according to the Project Management Body of Knowledge, isPRINCE2 defines:In some industries, particularly information technology, the term "project plan" can refer to a Gantt chart or other document that shows project activities along a timeline. While common, this use is inaccurate...

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The precedence relation between activities is represented by circles connecting to one or more arrows. The length of the arrow represents the duration of the relevant activity.

Sometimes a "dummy task" is added, to represent a dependency between tasks, which does not represent any activity.

Use of the ADM as a common project management practice has declined with the adoption of computer-based scheduling tools. The precedence diagram method (PDM) is often favored over the ADM.

The ADM is also known as the activity-on-arrow (AOA) method, it only show finish-to-start relationship.
ADM network drawing technique the start and end of each node or event is connected to an arrow.

The start of the arrow comes out of a node while the tip of the arrow goes into a node. Between the two nodes lies an arrow that represents the activity.

The event represented by the circular node consumes neither time nor resources.

• A node is a specific, definable achievement in the project.
• It has zero duration and consumes nil resources.
• All activities that lead into a node must be completed before the activity lies following this node can start.