This volume deals with the relations between grammar and interaction from different perspectives, with the aim of unraveling the way in which a language - through the different forms of discourse from which it emerges - reflects certain social and community-based schemas; that is, how language originates within the space shared by the speaker and the addressee(s). The first part ("Grammar and Interaction") concerns how interaction may intervene in grammar; the second part ("The Grammar of Interaction") approaches both notions and linguistic structures which are anchored in interaction while revolving around epistemicity, evidentiality and modality. The third part ("Interaction as a Model for Discourse") concerns how certain constructions emerge from interaction and are further used to model discourse. Finally, the fourth and last part of the book ("Interaction as a Driver for Change") focuses on how interaction may help to delimit linguistic categories.