Unlike the categories seen so far in this Enterprise Model, only Activities take place in time. In a similar structure to that of Assets, Other Activity Type is a fundamental category, and Activity Specification lays out a description of what an actual Activity is expected to involve. Here, however, the Activity Specification lays out the expected time and cost of the effort, while the actual activity ultimately describes the actual start and end dates involved.

Activity Structure includes not just component Activities (Work Breakdown Structure), but Activity Dependence as well. That is, not only is it important to know that the “Assemble bicycle” requires the Activity “Add front wheel to frame” and the Activity “Assemble front wheel ...

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