Its adverbial and interjective uses can, according to Hansen (1998a), be related to its canonical adjectival use (as in 'C"est bon' 'It's good'), its discourse-marking and hedging uses being more peripheral extensions of this. Beeching (2007c) charts the remarkable increase in rates of bon usage in both real and apparent time from 1968-2002. The present paper establishes the extent to which bon is pragmaticalizing by investigating its sociosituational variation and distributional frequency in the Corpus de Référence du Français Parlé. The rise in frequency of the compound expressions mais bon and parce que bon suggests a shift towards increased intersubjectivity 1. This chapter explores the relationship between synchronic and diachronic variation drawing, by way of illustration, on an analysis of the relative distributional frequencies of the senses or functions of the pragmatic particle bon in contemporary spoken French, either as an end-marker or as a hesitation marker. In addition to describing the senses of bon and its sociosituational variation, the chapter hopes to contribute to the literature on historical semantic change and the relative impact of cognitive factors, considerations to do with politeness and the pragmatic factors alluded to in Traugott and Dasher"s (2002) Invited Inferencing Theory of Semantic Change. The chapter is structured in the following way: after outlining the main theoretical strands, an overview is given of existing literature on the meanings and functions of bon and compounds of bon and how these may best be accounted for, integrating new corpus data within this account. The results of a qualitative and quantitative analysis of bon and compounds of bon in balanced extracts from the Étude Sociolinguistique d'Orléans (ESLO) (1968) Corpus, the Beeching (1988) Corpus and the Corpus de Référence du Français Parlé (2002) are then reported, followed by some tentative conclusions. Theories of Semantic Change Sweetser (1990), along with a number of other cognitive linguists (see Panther and Thornburg, 2003), argues that universal cognitive principles such as metaphor and metonymy can account for regularities in three important linguistic domains: polysemous relationships, lexical semantic change and pragmatic ambiguity. A number of fundamental relations of a