Which statement correctly defines a use case?

• A. A data schema used for persistence.
• B. A description of how a user will interact with a system to achieve a goal.
• C. A model of data flows used during deployment.
• D. A set of test cases for system performance.

Answer: (C)

A use case is a description of how a user will interact with a system to achieve a goal. It focuses on the actions the user takes, the system responses, and the intended outcome, capturing a real-world scenario from the user’s perspective. This helps define functional requirements and guides design, development, and testing around what the user needs to accomplish. The other statements describe different concepts: a data schema used for persistence is about how data is stored, not how a user interacts with the system; a model of data flows used during deployment relates to technical deployment or architecture rather than user behavior; and a set of test cases for system performance is about validating how the system performs under load, not describing user-driven workflows.