Requirements, if they are to be implemented successfully, must be _________ and testable.

Question

BlackTom AI · Accepted Answer

Measurable requirements can be quantified so that objective tests can determine whether they have been met.

1. Relevant knowledge points and concepts
- A well-written requirement must be unambiguous and verifiable. Verifiability usually means testability: you must be able to confirm through inspection, demonstration, analysis, or test that the requirement is satisfied.
- The SMART criteria (Specific, Measurable, Achievable, Relevant, Time-bound) emphasize "Measurable" as the key property that enables testing and verification.
- A requirement that lacks measurable criteria ("fast", "user-friendly") cannot be objectively tested without additional specification.

2. Step-by-step reasoning
- Start with the premise: the requirement must be "testable." For a requirement to be testable, there must be concrete acceptance criteria or metrics.
- Translate a generic requirement into a measurable one: e.g., "The system shall respond within 2 seconds for 95% of requests." This provides an objective threshold and statistical acceptance criteria that can be tested.
- If a requirement lacks a measurable metric, testers cannot design pass/fail tests, so the requirement fails the testability property.

3. Intermediate reasoning steps (logical, since no numeric calculations)
- Testability requires precise criteria -> Precision requires quantification -> Quantification is measurability -> Therefore, testable requirements must be measurable.

4. Why the correct answer is correct
- "Measurable" directly supplies the quantification necessary for testing and verification. A measurable requirement yields acceptance criteria and test cases, satisfying the condition "must be ______ and testable."

5. Why the other options are incorrect
- Accessible: describes usability/access for users (e.g., for disabilities) but does not inherently make a requirement testable unless quantified.
- Navigatable: refers to ease of navigation; subjective and not a standard term for requirement quality nor guarantees testability.
- Reliable: is a desirable quality but must be quantified (e.g., 99.9% uptime) to be testable; the plain term alone does not ensure testability.

6. Conclusion
Because testability requires quantification, the correct completion is "measurable." This matches the provided answer: measurable.

Requirements, if they are to be implemented successfully, must be _________ and testable.单项选择题

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