Arrow diagramming method: Difference between revisions

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'''Arrow Diagramming Method''' (ADM) is a network{{Short description|Network-diagramming technique in which activities are represented by arrows. }}

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'''Arrow Diagramming Method''' (ADM) is a network diagramming technique in which activities are represented by arrows.

'''Arrow diagramming method''' (ADM) is a network diagramming technique in which activities are represented by arrows.<ref>CPM in Construction – A Manual for General Contractors(Copyright 1965 by the Associated General Contractors of America)</ref> ADM is also known as the activity-on-arrow (AOA) method.

It is used for [[scheduling]] activities in a [[project plan]].

<br />The precedence relation between activities is represented by circles connecting to one or more arrows.

==Usage==

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

ADM is used for scheduling activities in a [[project plan]]. Precedence relationships between activities are represented by circles connected by one or more arrows. The length of the arrow represents the duration of the relevant activity. ADM only shows finish-to-start relationships, meaning that each activity is completed before the successor activity starts.

Sometimes a "dummy task" is added, to represent a [[dependency (project management)|dependency]] between tasks, which does not represent any actual activity. The dummy task is added to indicate precedence that can't be expressed using only the actual activities. Such a dummy task often has a completion time of 0.

[[Image:Arrow Diagramming Method.png|500px|ADM example]]

Use of ADM as a common project management practice has declined with the adoption of computer-based scheduling tools. In addition, the precedence diagram method (PDM), or activity-on-node (AON), is often favored over ADM.<ref>A Guide to the Project Management Body of Knowledge, 4th Edition: ANSI/PMI 99-001-2008 (copyright Project Management Institute, Inc. 2008)</ref>

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 lines following this node can start.

== See also ==

* [[Precedence Diagramdiagram Methodmethod]]

* [[Program Evaluation and Review Technique]]

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== References ==

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{{Reflist}}

[[Category:Project management techniques]]

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