||Paul Grice coined the term 'implicature' and its two sub-categories: conventional implicature and conversational implicature. Implicatures are what a speaker meant in addition to or instead of what was literally said. Grice originally intended implicature to serve as a gap between what a speaker said and what a speaker meant, since speakers regularly do mean more than (or something contrary to) what they literally said. While many except that implicatures fit in that gap, it is debated that they do not completely fill it. Since Grice, neo-Griceans have made various emendations to the notion of implicature. Others, have sought to account for roughly the same phenomena by different theoretical means, chiefly Relevance theorists, such as Sperber and Wilson.