Which of the following best describes a use case?

Question

BlackTom AI · Accepted Answer

A use case describes a task the system performs to achieve a specific goal for an actor.

1. Relevant knowledge points and concepts
- In software engineering and UML, a use case models functional requirements: it captures a sequence of interactions between an actor (a user or external system) and the system to accomplish a goal.
- Key elements: actor (who initiates), the system boundary, the use case name (goal), main success scenario (steps), and alternative/exception flows.
- Use cases are behavior/functional descriptions, not physical components or data structures.

2. Step-by-step reasoning process
- Identify what a use case represents: a functional interaction culminating in a business or user goal (e.g., "Place Order", "Log In").
- Consider the provided options: match each to the definition of a use case.
  - "A hardware device connected to the system": this is an external entity or actor, not the behavior itself.
  - "A container holding source files": this describes a repository or folder (a physical/storage concept), not a description of system behavior.
  - "A set of program variables": this is an internal data structure, unrelated to goal-driven interactions.
  - "A task performed by the system": represents actionable behavior to achieve a goal—this aligns with the definition of a use case.

3. Intermediate examples (illustrative)
- Example use case "Withdraw Cash": actor = customer; steps = insert card → enter PIN → select amount → system dispenses cash. This shows the use case is the task/sequence the system performs.

4. Why the correct answer is correct
- "A task performed by the system" captures that a use case documents the system’s functional behavior in response to actor interactions to achieve a goal. This is precisely the role of use cases in requirements modeling.

5. Why other options are incorrect
- Hardware device: an external actor or resource, not the behavioral specification.
- Container holding source files: a storage construct, not a behavior/goal description.
- Set of program variables: internal implementation detail, not a functional requirement or interaction sequence.

Conclusion: The correct answer is "A task performed by the system," which matches the provided answer.

Which of the following best describes a use case?单项选择题

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