What is a base use case?

What is a base use case?

• A. A use case that is connected to a primary actor via an association relationship
• B. A use case that has no extensions
• C. The subject
• D. The main success scenario

Answer: (A)

In use-case modeling, the base use case is the primary interaction that delivers a goal to the actor who initiates it. It’s identified by its direct association with the primary actor—this shows who starts the interaction and whose goal is being fulfilled. Extensions are separate use cases that extend the base use case to add optional or alternative behavior at specific extension points, but they don’t define what makes a use case a base one. While the main success scenario lives inside the base use case as the typical path to achieve the goal, the defining idea here is the direct association to the primary actor.

In use-case modeling, the base use case is the primary interaction that delivers a goal to the actor who initiates it. It’s identified by its direct association with the primary actor—this shows who starts the interaction and whose goal is being fulfilled. Extensions are separate use cases that extend the base use case to add optional or alternative behavior at specific extension points, but they don’t define what makes a use case a base one. While the main success scenario lives inside the base use case as the typical path to achieve the goal, the defining idea here is the direct association to the primary actor.