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The concept of criteria has been interpreted as the central notion in the later Wittgenstein’s account of how language functions, in contrast to the realist semantics of the Tractatus. According to this later account, a concept possesses a sense in so far as there are conditions that constitute non-inductive evidence for its application in a particular case. This condition on a concept’s possessing a sense has been thought to enable Wittgenstein to refute both solipsism and scepticism about other minds. There are powerful objections to this conception of criteria, which have led some philosophers to look for an alternative account of the role of criteria in Wittgenstein’s later philosophy.