2.5 Task 3: Identify the Relationships among the Entities

Form and Function of Relationships

As a matter of definition, systems are composed of a set of entities and their relationships. By now, the reader should have come to expect that these relationships can have two characters: they can be functional relationships or formal relationships.

Functional relationships are relationships between entities that do something; they involve operations, transfers, or exchanges of something between the entities. We sometimes call ­functional relationships interactions to emphasize their dynamic nature. During interactions, operands are exchanged by the entities or acted on jointly. Thus a heart exchanges blood with a lung, and a team member shares results ...

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