UMLR — Location: 18.1.3 Semantics Use Cases and Actors P. 686 - Multiplicity at Use Case end

current text: “When an Actor has an association to a UseCase with a multiplicity that is greater than one at the UseCase end, it means that a given Actor can be involved in multiple UseCases of that type.”

[AC] This relationship between Actors and UseCases is asymmetric and in my opinion inconsistent. When a UseCase has a upper multiplicity >1 towards Actor, this means that multiple instances of Actor are involved. At the opposite end, the meaning is undetermined. This should be avoided in a metamodel definition. It would surely be less ambiguous to state that the upper multiplicity from Actor to UseCase is just 1.