Howard Wettstein, "Has Semantics Rested on a Mistake?"

Frege's criterion of adequacy for semantic theory is that it register differences of cognitive significance. New theories of reference do not meet Frege's criterion of adequacy, and attempts by new theorists like Kaplan and Perry to satisfy the criterion by employing "character" or "role" fail to do justice to Frege's data. The proper response for new theorists of reference is to reject Frege's criterion of adequacy. Belief reports do not favor either Fregeans or new theorists.

David Kaplan, "Words"

We should abandon the idea of types and tokens of words, and replace it with an idea of words as temporal continuants that depend for their continued existence on speaker intentions to reproduce them.