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Enterprise Model Patterns: Describing the World (UML Version) by David C. Hay

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As described in Chapter 7, Activities, either at the specification level or at the instance level, often depend on each other. For example, it may be that one activity cannot begin before another ends. Figure 16-3 shows this as Activity Dependence and Activity Specification Dependencekinds of Activity Structure and Activity Specification Structure, respectively.

Each instance of either kind of Activity Dependence must be an example of one Activity Dependence Type. Activity Dependence Type describes the nature of the Activity Dependence. It may be either:

·         End-to-start (ES) – the on Activity (or Activity Specification) must complete before the off Activity (or Activity Specification) can begin.

·         Start-to-start ...

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