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graph(Noun) An ordered pair , where is a set of elements called vertices (or nodes) and is a set of pairs of elements of , called edges; informally, a set of vertices together with a set edges that join these vertices.
The work breakdown structure or the product breakdown structure show the part-whole relations. In contrast, the project network shows the before-after relations. The most popular form of project network is activity on node (AON)(as shown above), the other one is activity on arrow (AOA).The condition for a valid project network is that it doesn't contain any circular 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.roject 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.