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A network diagram can be created by hand or by using diagram software. There are two types of network diagrams, activity on arrow ([[Arrow Diagramming Method|AOA]]) and activity on node ([[Precedence Diagram Method|AON]]). Activity on node diagrams are generally easier to create and interpret. To create an AON diagram, it is recommended (but not required) to start with a node named ''start''. This <nowiki>"activity"</nowiki> has a duration of zero (0). Then you draw each activity that does not have a predecessor activity (''a'' and ''b'' in this example) and connect them with an arrow from start to each node. Next, since both ''c'' and ''d'' list ''a'' as a predecessor activity, their nodes are drawn with arrows coming from ''a''. Activity ''e'' is listed with ''b'' and ''c'' as predecessor activities, so node ''e'' is drawn with arrows coming from both ''b'' and ''c'', signifying that ''e'' cannot begin until both ''b'' and ''c'' have been completed. Activity ''f'' has ''d'' as a predecessor activity, so an arrow is drawn connecting the activities. Likewise, an arrow is drawn from ''e'' to ''g''. Since there are no activities that come after ''f'' or ''g'', it is recommended (but again not required) to connect them to a node labeled ''finish''.
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