A concept or model should also communicate something meaningful. If too many people disagree over the meaning of a concept, it's utility in communication is diminished. For example, if no one really agrees on what constitutes an elite, the concept of an elite does not mean the same thing to everyone. If one defines an elite as a group of democratically elected public officials who are representative of the general public, one is communicating a different idea in using the term than one who defines an elite as an unrepresentative minority that makes decisions for society based on it's own interests.