 A second dimension has to do with the relative importance given to two models of communication. One is the coding-decoding model of Locke and Saussure, as developed in the twentieth century logic and philosophy in compositional theories of meaning and truth. The other model, which we owe mostly to Grice, also has Lockean roots, in that communication of belief from speaker to hearer lies at its center. But the mechanism of discovery is not decoding according to conventional rules, but intention-recognition and discovery based on ampliative inference. The two models are not inconsistent, and all theorists accept elements of each. The issue is their relative centrality and importance in the phenomenon of human communication with language.