https://www.educative.io/courses/grokking-the-object-oriented-design-interview/7npMYmzm8DA
What does “Generalization between actors” relationship between customer and guest mean?
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Generalization between actors is the same as that of generalization between classes. For example, in classes, when we say that an “employee” is a “person”, this means that “employee” is inherited from “person” and includes all functionalities of “person”. Similarly, for actors, we will say “Customer” includes all functionality of “Guest”.
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