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Aproject network diagram, also known anactivity network diagram (AND) is agraph that displays the order in which a project’s activities are to be completed. Derived from thework breakdown structure, theterminal elements of a project are organized sequentially based on the relationship among them. It is typically drawn from left to right to reflect project chronology.[1]
The Activity-on-Node (AON) technique uses nodes to represent individual project activities and path arrows to designate the sequence of activity completion.[2] Nodes are labelled using information pertaining to the activity. According to Project Management, nodes should at least display the following information:[3]
Start and finish times are used to determine thecritical path of a project.Activity float, or slack, time is used in project crashing.
The condition for a valid project network is that it doesn't contain anycircular references.
Project dependencies can also be depicted by a predecessor table. Although such a form is very inconvenient for human analysis,project management software often offers such a view for data entry.
An alternative way of showing and analyzing the sequence of project work is the design structure matrix ordependency structure matrix.
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