Which statement best defines a base use case?

Which statement best defines a base use case?

• A. A use case that is connected to a primary actor via an association relationship
• B. The final step in the main success scenario
• C. The event that starts the use case
• D. The postconditions

Answer: (A)

In use-case modeling, a base use case is defined by its direct connection to a primary actor through an association. That association shows which actor initiates or participates in the use case, identifying the main goal the actor wants to achieve with the system. This relationship is what characterizes the base use case as the primary unit of functionality exposed to the actor. The event that starts a use case, called the initiating event or trigger, is about how the use case begins, not what defines it. The final step in the main success scenario is part of the flow of events within the use case, not what makes a use case a base one. Postconditions describe the state after the use case completes, again describing results or conditions, not the defining relationship to an actor.

In use-case modeling, a base use case is defined by its direct connection to a primary actor through an association. That association shows which actor initiates or participates in the use case, identifying the main goal the actor wants to achieve with the system. This relationship is what characterizes the base use case as the primary unit of functionality exposed to the actor.

The event that starts a use case, called the initiating event or trigger, is about how the use case begins, not what defines it. The final step in the main success scenario is part of the flow of events within the use case, not what makes a use case a base one. Postconditions describe the state after the use case completes, again describing results or conditions, not the defining relationship to an actor.