Default values,criteria and constructivism

Wittgenstein, in his later writings, gave an account of the meaning of expressions in terms of criteria for their application. As with many of Wittgenstein's later ideas the notion of a criterion has proved difficult to explicate. A recent account, which ties criteria to the philosophical doctrine of constructivism, provides a link between the concept of a criterion and a series of ideas about language understanding which have emerged in the past few years. It is shown that these ideas can be made to cohere within a general constructivist framework, and that an alternative realist framework is inadequate in this respect.