This book advances our understanding of change over time in human social conduct, and represents the first consolidated effort to reveal how micro-analytic studies of social interaction address such issues. The book presents a collection of longitudinal studies drawing on conversation analysis across a variety of settings, practices, languages and timescales, and analyses the ways in which participants produce and deal with practices changing over time. This edited collection will interest students and scholars of conversation analysis, sociolinguistics, discourse analysis, interactional linguistics and pragmatics.