What is a representation of how one or more actors use a system to accomplish a goal?

• A. Use case
• B. Workflow
• C. Wireframe
• D. Sequence diagram

Answer: (A)

A use case focuses on describing how one or more actors interact with the system to achieve a goal. It centers on the user’s objective and the system’s responses, laying out the typical steps (the main flow) and any alternative paths if things go differently. This makes it a clear, user-oriented way to capture functional requirements, helping teams understand what the system must do from the user’s perspective and how it should behave in common scenarios. For example, a use case might describe a customer placing an order: the customer initiates the process, the system guides them through selecting items, reviewing the cart, and completing checkout, and the system then confirms the order. In contrast, a workflow describes a broader sequence of tasks in a process, not necessarily tied to a single system interaction; a wireframe shows layout and UI structure rather than the goals and interactions; and a sequence diagram focuses on timed message exchanges between components, which is more about software internals than user goals.