Which of the following statements best describes a Use Case?

Question

BlackTom AI · Accepted Answer

To tackle what a Use Case best describes, I’ll examine each option and map it to the core notion of a Use Case in system analysis.
Option 1: 'A Use Case represents behaviour which when performed is of value to one or more actors' This aligns closely with the definition in software engineering: a Use Case describes a sequence of interactions between actors and the system that yields observable value or outcomes for one or more actors. It focuses on the system’s behavior from the actor’s perspective and the value delivered by completing the interaction.
Option 2: 'A Use Case represents the behaviour of the actor which results from the adequate performance of the system' This is not accurate because a Use Case emphasizes the system–actor interaction and the value delivered, not merely the actor’s internal behavior as a consequence of system performance. It places the emphasis on the actor’s behavior in isolation, which misses the essential system-driven sequence of actions.
Option 3: 'A Use Case represents a set of steps performed by an actor as he tries to act out an applications behaviour' This statement is close but misleading: while a Use Case does involve steps, it is the system's response and the interaction sequence, not just the actor performing steps to imitate the system’s behavior. A Use Case captures the goal, the actors involved, and the system’s responsibilities, not merely an actor executing steps.
Option 4: 'A Use Case is a method used by a Business Analyst to make his case for how the actor should behave.' This describes more of an advocacy or method for elicitation rather than the structural concept of a Use Case. It confuses the tool (use case) with a process a BA uses to persuade stakeholders about actor behavior.
In summary, the strongest alignment is with Option 1, which correctly encapsulates a Use Case as a description of valuable system–actor interactions that yield value to one or more actors, reflecting the purpose and scope of use-case modeling. The other options either misplace focus on actor behavior alone, reduce the concept to a mere sequence of steps without the system’s perspective, or present the Use Case as a BA’s advocacy method rather than a modeling artifact.

Which of the following statements best describes a Use Case?

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