This book takes contrast, an issue that has been central to phonological theory since Saussure, as its central theme, making explicit its importance to phonological theory, perception, and acquisition. The volume brings together a number of different contemporary approaches to the theory of contrast, including chapters set within more abstract representation-based theories, as well as chapters that focus on functional phonetic theories and perceptual constraints. This book will be of interest to phonologists, phoneticians, psycholinguists, researchers in first and second language acquisition, and cognitive scientists interested in current thinking on this exciting topic.