Consider this user story: “As a commuter, I want to top‑up my travel card online so that I can avoid station queues.”

What crucial component is still missing?

Question

Consider this user story: “As a commuter, I want to top‑up my travel card online so that I can avoid station queues.”

What crucial component is still missing?

BlackTom AI · Accepted Answer

INVEST quality requires a user story to be Testable — that is the missing piece: acceptance criteria that make the story testable. Relevant concepts: - User story template: “As a , I want so that ” supplies persona, goal, and value. The given story includes all three. - INVEST mnemonic: Independent, Negotiable, Valuable, Estimable, Small, Testable. The “Testable” element is realized via acceptance criteria. - Acceptance criteria: concrete, verifiable conditions (often written as Given‑When‑Then) that define when the story is done and can be tested. Step‑by‑step reasoning: 1. Inspect the story: “As a commuter, I want to top‑up my travel card online so that I can avoid station queues.” Role = commuter, feature = top‑up online, benefit = avoid queues. Those parts are present. 2. Check INVEST: Independent? negotiable? Valuable? Estimable? Small? Testable? The story lacks explicit statements that can be executed or verified, so “Testable” is missing. 3. Define what acceptance criteria would do: specify payment success behavior, balance update, confirmation messaging, error cases, security/authorization, and allowed top‑up amounts. These permit writing manual or automated tests. 4. Conclusion: Because no acceptance criteria are shown, the story cannot be unambiguously tested or accepted. Example acceptance criteria (illustrative): - Given a valid card and payment, when user completes payment, then the card balance is increased immediately and a confirmation email is sent. - Given insufficient funds, when user attempts payment, then an error message explains failure and no balance change occurs. Why the correct answer is correct: Acceptance criteria make the story verifiable and form the basis of the Definition of Done; without them, developers, testers, and stakeholders cannot agree when the story is complete. Why other plausible items are not the crucial missing component: - UI mockups, implementation tasks, estimates, or security requirements may be useful but are secondary; acceptance criteria are essential to make the story testable. Final confirmation: The crucial missing component is “Acceptance criteria that make the story testable.”

Consider this user story: “As a commuter, I want to top‑up my travel card online so that I can avoid station queues.” What crucial component is still missing?单项选择题

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