All of the nouns that appear in the problem description should become classes.

Question

Quizplus · Accepted Answer

Not all nouns in a problem description should become classes in an object-oriented design. The decision to make a noun a class should be based on its relevance to the problem domain, its role in the system, and whether it encapsulates both data and behavior that is necessary for the solution. Some nouns may simply represent attributes of other classes or may not be significant enough to warrant their own class.

All of the Nouns That Appear in the Problem Description