What is the subject?

What is the subject?

• A. Represents the system that owns and performs the use cases
• B. The event that starts the use case
• C. Alternative sequences of steps
• D. The postconditions

Answer: (A)

In use-case modeling, the subject is the system boundary that owns and executes the use cases. It represents the actual system being designed—the thing the actors interact with and that carries out the described functionality. That’s why this choice best fits: it directly identifies the system as the owner and performer of the use cases. The initiating event is the trigger that starts a use case, not the system itself. Alternative sequences are branches or flows within a use case, not the subject. Postconditions describe the state after the use case completes, again not the subject.

In use-case modeling, the subject is the system boundary that owns and executes the use cases. It represents the actual system being designed—the thing the actors interact with and that carries out the described functionality. That’s why this choice best fits: it directly identifies the system as the owner and performer of the use cases.

The initiating event is the trigger that starts a use case, not the system itself. Alternative sequences are branches or flows within a use case, not the subject. Postconditions describe the state after the use case completes, again not the subject.