Arrow Diagramming Method Example and Calculation Steps | Activity-on-Arrow (AOA) Example

Arrow diagramming method (ADM) is a network diagramming technique in which activities are represented by arrows. In this Arrow Diagramming Method Example, we will discuss the uses of arrow diagrams and demonstrate the critical path calculation.

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00:00 - Intro
00:07 - Arrow Diagramming Method Example and Calculation Steps
00:12 - Arrow diagramming method (ADM)
01:09 - Arrow diagramming method example
01:29 - Step 1: Forward Pass Calculation
01:49 - Step 2: Backward Pass Calculation
01:59 - Step 3: Float Calculation
02:05 - Step 4: Identifying the Critical Path

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.

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 duration 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.


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