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Sperber and Wilson (1995) ground their defínition of communication on their criticism of Grice's intentional defínition of non-natural meaning. In such a perspective, communication is considered as an act rather than as a process. Sperber and Wilson propose two definitions of this fundamental concept. In a first time, they argüe that communication involves two specific intentions; afterwards, they equate it with ostensión. This paper examines and criticizes their proposals, confronting them to ordinary intuition. Some crucial issues are discussed: the equivalence of Sperber and Wilson's two definitions, the nature of the evidence used in communication, the intentionality of communication, the content of the communicative intention, the notion of mutual mamfestness, and the problem of infinite regress.