Precedence Diagramming 1 – Arrow Diagramming Method

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03:00 – Introducing the content of the 3 videos
02:30 – The activities, precedence, and duration
03:43 – Drawing the Arrow Diagram or PERT
10:15 – Calculating Start and End Times of the activities

This is the first video in a series of 3 about precedence diagramming and scheduling. In this short series, we will look into the arrow (ADM) and precedence diagramming methods (PDM), the different ways to complete the calculations and draw the Gantt chart.

In the first video, I will explain how to draw the arrow diagram using the precedence information from the table and calculating the start and finish times of the activities.

In this method, the activities are represented on arrows and each arrow has one start and one finish node. These nodes are event nodes and they show the start and the end of the activity.
The first event node starts at time 0 and corresponds with the start of the project. The last node is the end node of the project. Each schedule has one start and one end node.
The calculations are done on a time scale and start at 0. It is best to compare with a time scale and chronometer where the counting starts from 0.
The ADM has to follow specific rules and the calculations are not as easy as the more recently used PDM. A specific characteristic of the ADM is that there can be dummy activities to show precedence information. Dummy activities have a duration of 0.

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