We can all recognize fluency and practice it, but often do not understand what linguistic and paralinguistic operations are involved. This text tries to solve this puzzle. It begins by exploring perceptions of fluency to understand their common denominators. It goes on to pinpoint the specific features which promote fluency while emphasizing its relative and interactional nature. These analyses produce both a methodological framework and a pedagogical strategy, illustrated by sample classroom activities. Language teachers, applied linguists, linguists and their students should find this book an accessible companion to the teaching and study of oral language, with French as its domain of application.