Which of the following BEST describes an use case?

Question

BlackTom AI · Accepted Answer

A use case describes a functional requirement of a system: it specifies a goal-oriented interaction between an external actor (user or another system) and the system to achieve a particular outcome.

1) Relevant knowledge points and concepts
- Use case (UML/requirements): a narrative or model that captures how actors use the system to accomplish goals; focuses on behavior and functional requirements.
- Functional vs non-functional requirements: functional = what the system should do (behaviors, services); non-functional = qualities (performance, security).
- Design/implementation artifacts (class implementations, code, database schema) are lower-level design or implementation details, not use cases.

2) Step-by-step reasoning
- Determine what a use case is intended to capture: interactions/scenarios that achieve user goals.
- Map that to the options: only the option describing requirements/behavior fits this definition.
- Therefore the best match is the option that identifies use case as a functional requirement.

3) Calculations/intermediate steps
- No numerical calculations are required. Intermediate logical mapping: use case → interaction/behavior → functional requirement.

4) Why the correct answer is correct
- Use cases document functional requirements by describing sequences of actions and system responses for achieving a user goal. They are written in plain language or modeled in UML to specify behavior, making option B (“A functional requirements of a system”) accurate.

5) Why the other options are incorrect
- A: “A detailed class implementation” — describes code/design-level structure (classes, attributes, methods); too low-level for a use case.
- C: “A sequence of Java statements” — code detail, not a requirements-level behavior description.
- D: “A database schema” — structural data design, not a behavior/interaction description.

6) Conclusion
Thus, the use case best corresponds to a functional requirement of a system, confirming the correct answer is B.

Which of the following BEST describes an use case?单项选择题

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