 The relevant notion of content is that of propositional content, something that can be judged, and the norms in question govern the “use” of concepts. We intend the talk of propositions and concepts in this context to be uncontentious, and not depend on any specific construals of these notions. A proposition, simply, is anything that has truth conditions essentially; it is whatever the propositional attitudes are attitudes towards. And talking of “concepts” should not be understood as implying a commitment to either structured contents or to a language-like, syntactically structured medium of representation. In this sense, a concept is “used” whenever a subject has an intentional mental  state.[44]