Figure 7-4 shows the first approach: first, relationships are added asserting that each Activity may be composed of one or more other Activities and that each Activity Specification may be composed of one or more other Activity Specifications. Note that these are constrained versions of the first option, in that an Activity may be part of no more than one other Activity and each Activity Specification may be part of no more than one other Activity Specification.

This approach treats an Activity as a larger chunk of work, composed of Activity Steps. Figure 7-4 adds Activity Step and Activity Specification Step to show this at both levels. An Activity Step is a subdivision of an Activity that is the execution of ...

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