In the past decade there has been a surge of interest in the study of language teacher cognition – what language teachers know, think and believe – and of its relationship to teachers’ classroom practices. Social Interaction and Teacher Cognition is the first book to use a discursive psychological perspective to examine teacher cognitions. Informed by conversation analysis (CA), the book offers a close examination of cognition-in-interaction in three distinctive aspects: learning to teach, novice and expert teachers’ cognition, and interactive decision making. The book views cognition as a socially constructed and contextual process, and treats interaction as a framework that deals with psychological matters in a public and visible way. It will be of particular relevance to those researching teacher cognition in EFL contexts and will appeal to anyone interested in the study of classroom interaction.