R900 - modelint/shlaer-mellor-metamodel GitHub Wiki

R900 / 1:Mc

Activity executes zero, one or many Action

Action is executed in exactly one Activity

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Every Action must be defined within some Activity. This is typically and, depending on how we finailize our concept of bridging between Domains, possibly exclusively a State Activity or a Method.

In the case of a State Activity, it is not uncommon to define an Activity with no Actions in it. There is no utility in having an empty Method, however, except as a placeholder for future development.