As either subjects, or predicates, terms can have a couple properties worth mentioning: vagueness and ambiguity. Evaluating whether terms are clear and unambiguous is crucial in deciding whether a proposition is true and whether a syllogism is sound. Using the properties we have learned, we can now characterize specific components of arguments from a logical perspective. We understand all of this through the language of members and categories, which we lay the basis for in this lesson.