 While teleological theories of mental content are quite diverse, they all share the idea that psycho-semantic norms depend, in part at least, on functional norms. Later sections explain various ideas about the nature of this dependence. This section describes the notion of function employed. It is generally thought to be in some sense both teleological and normative, but both “teleological” and “normative” need qualifying, and the use of these terms can lead to unnecessary misunderstandings. Let’s take the first of these terms first.