There are two types of diagrams: -
• Activity on Arrow diagram ( Arrow diagram )
• Activity on Node diagram ( Precedence diagram )
AOA (Activity on Arrow) diagram
Before we understand what AOA is, let’s consider the table below which has list of
activities to start a computer institute. It has five columns below is description about the
• First column is just a sequence number for the activity.
• Second column is a short activity description,
• Third column has number of days needed to complete the activity.
• Fourth column describes which activity needs to be completed to start this activity
• Fifth column shows what the final output of the activity is.
|| Activity Description
||Decide a location
||Sign the lease
||Prepare Course Material
||Ad displayed in news paper|
Table: - Computer institute Activity list
Figure: - AOA
As the name suggests Activity on Arrow (i.e. AOA) which means arrows represent activity and the nodes represent finished activities. Figure ‘AOA’ represents how the activity is shown on the arrow and how the node shows the finished activity. So the node represents completed activities and arrows represent activities.
So let’s join the activities and nodes defined in table ‘Computer Institute Activity List’. Figure ‘AOA for Computer Institute’ shows how the AOA diagram is built. We have put
the activities on the arrow and the nodes represent the finished activity. On the arrow
itself we have put the number of days for every activity.
Figure: -AOA for Computer Institute
AON (Activity on Node) diagram
Figure: - AON
In AOA we view Activity on arrow while in AON we view Activity on the Node. So
the change of thinking shifts from viewing activities as events (AON) rather than
activities happening between milestones.
Figure ‘AON’ represents the same in a pictorial manner. Below is the same redrawn AON diagram for the computer institute activity.
Figure: - AON for Computer Institute
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