Conversation analysis is a methodology that originated over three decades ago as a sociolinguistic approach but has since been adopted by scholars in a variety of other areas, including applied linguistics and communication. It is of great utility in second language acquisition research for its demonstrations of how micro-moments of socially distributed cognition instantiated in conversational behavior contribute to observable changes in the participants' states of knowing and using a new language. This volume describes the methodology in detail, discusses its relevance for current theories of SLA, and uses two extended examples of conversational analysis to show how learners succeed or fail at the job of learning the meaning of a word or phrase in conversational context.