Which element is described as the system that owns and performs the use cases?

Which element is described as the system that owns and performs the use cases?

• A. Subject
• B. Trigger
• C. Extensions
• D. Guarantees

Answer: (A)

In use-case thinking, the thing that owns and performs the sequences of interactions is the subject. The subject represents the system under design and defines the boundary inside which all the use cases live and are executed in response to actors. Triggers are merely events that start a use case, extensions are optional or alternate flows that extend the main path, and guarantees describe the commitments the system makes after a use case completes. So the one that fits the description of owning and performing the use cases is the subject.

In use-case thinking, the thing that owns and performs the sequences of interactions is the subject. The subject represents the system under design and defines the boundary inside which all the use cases live and are executed in response to actors. Triggers are merely events that start a use case, extensions are optional or alternate flows that extend the main path, and guarantees describe the commitments the system makes after a use case completes. So the one that fits the description of owning and performing the use cases is the subject.