What is a limitation of the nouns & verbs method?

Question

BlackTom AI · Accepted Answer

The nouns-and-verbs method extracts candidate classes from nouns and candidate operations from verbs in requirements text; its core limitation is that it does not tell you which of those verb-derived operations belong to which noun-derived classes.

1) Relevant knowledge points and concepts
- Object-oriented analysis: identify classes, attributes, and methods from requirements.
- Nouns typically map to candidate classes or attributes; verbs typically map to candidate methods/behaviors.
- The nouns-&-verbs technique is a heuristic for discovery, not a full specification method.

2) Step-by-step reasoning
- Read requirement sentences and list nouns (e.g., "Customer", "Order") and verbs (e.g., "place", "cancel").
- Nouns become candidate classes; verbs become candidate methods.
- The method stops at listing candidates; it does not include a systematic mechanism to attach each verb to a specific class.
- Additional analysis (scenario tracing, CRC cards, sequence diagrams) is needed to allocate methods to classes.

3) Calculations/intermediate steps
- No numeric calculations apply; intermediate step example: from "Customer places Order", nouns = {Customer, Order}, verb = {places}. The method yields both but does not indicate whether "place" is a method of Customer, Order, or a separate controller.

4) Why the correct answer is correct
- Option c ("It doesn’t specify which methods belong to which class") precisely describes the gap: verbs are identified but their ownership (which class should implement them) is unspecified by the simple heuristic.

5) Why other options are incorrect
- a. "It ignores attributes completely": incorrect — nouns and noun phrases often reveal attributes (e.g., "order date").
- b. "It can’t be used for large programs": incorrect — it can be used but becomes less effective/scalable; it's not true that it cannot be used at all.
- d. "It doesn’t identify classes at all": incorrect — identifying candidate classes is the main purpose (nouns → classes).

6) Conclusion
Thus the best choice is c. This matches the provided correct answer: c. It doesn’t specify which methods belong to which class.

What is a limitation of the nouns & verbs method?单项选择题

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What is a limitation of the nouns & verbs method?单项选择题

类似问题

If one of the requirements in a university system is that a teacher can update keywords of a subject, which class would get an operation "update Keywords"?

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希望你的学习变得更简单

Select the right description for each of the following objects: 1: Entity 2: Data access 3: Control 4: Boundary