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Home PMP Time Management Arrow Diagramming Method Example
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Arrow Diagramming Method Example

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    Arrow Diagramming Method Example
    Arrow Diagramming Method Example

    Arrow Diagramming Method Example

    Arrow diagramming method (ADM) is a network diagramming technique in which activities are represented by arrows.[1] ADM is also known as the Activity-On-Arrow (AOA) method. It has been used long time to determine the critical path and identify resource problems and feasible solutions when the approximate duration and resource requirement of all the activities of network diagram are known. In this article we will analyze an arrow diagramming method example and review the basics of this method.

    There are two main elements of the Arrow Diagramming Method(ADM) which are arrows and nodes. One arrow represents one activity to be performed. The tail of the arrow is the start of the activity, the head of the arrow is the end of the activity and the length of the arrow is the duration of the activity.

    Activities (Arrow Diagramming Method)
    Activities (Arrow Diagramming Method)

    In the forward pass, we calculate the Start Dates of all the nodes. In the backward pass, the end node’s Start Date will be its Finish Date and the backward pass proceeds by subtracting the durations of the activities leading to the end node from the end node’s Finish Date to arrive at the Finish Dates for the preceding nodes.

    The following example shows a simple Activity on Arrow Diagram.

    Activity on Arrow Diagram
    Activity on Arrow Diagram

    In this example A,B,C,D,E,F,G rows are representing the activities. Numbers above the rows are activity durations. As shown in the schema above, in Arrow Diagramming Method(ADM), only F-S Relationship is used to link activities.

    Step 1 : Forward Pass Calculation

    Forward Pass Calculation - Arrow Diagramming Method (ADM)
    Forward Pass Calculation – Arrow Diagramming Method (ADM)

    Step 2 : Backward Pass Calculation

    Backward Pass Calculation-Arrow diagramming method (ADM)
    Backward Pass Calculation-Arrow diagramming method (ADM)

    Step 3 : Float Calculation for Each Activity

    Float Calculation-Arrow diagramming method (ADM)
    Float Calculation-Arrow diagramming method (ADM)

    Float can be calculated by subtracting the Start Date of an activity from its Finish Date.

    Step 4 : Identifying the critical path

    Critical Path-Arrow diagramming method (ADM)
    Critical Path-Arrow diagramming method (ADM)

    The critical path is the longest path in the network diagram and total float of critical path is zero. As shown in the schema above, critical path is marked red.

    Summary

    The Arrow Diagramming Method(ADM) and The Precedence Diagramming Method(PDM) are two network scheduling techniques. The first one is the traditional one used widely in the past. The second one is the current method that we are using widely now. In this simpe arrow diagramming method example we show how to make forward, backward, total float and critical path calculation. Nowadays the arrow diagramming lost it’s popularity because of the introduction of software solutions but in order to use these sorftwares successfully, it is important to understand both scheduling techniques.

    References

    [1] CPM in Construction – A Manual for General Contractors (Copyright 1965 by the Associated General Contractors of America )

     

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    Arrow diagramming method

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    Arrow diagramming method (ADM) is a network diagramming technique in which activities are represented by arrows. [1] ADM is also known as the activity-on-arrow (AOA) method.

    Usage[ edit ]

    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 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.

    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. [2]

    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[ edit ]

    • Precedence diagram method
    • Program Evaluation and Review Technique

    References[ edit ]

    1. ^ CPM in Construction – A Manual for General Contractors(Copyright 1965 by the Associated General Contractors of America)
    2. ^ A Guide to the Project Management Body of Knowledge, 4th Edition: ANSI/PMI 99-001-2008 (copyright Project Management Institute, Inc. 2008)

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