This series focuses on the main topics of study in phonological theory today. It consists of accessible yet challenging accounts of the most important issues to consider when examining the phonology of natural languages. Some topics have been the subject of phonological study for many years, and are here re-examined in the light of new developments in the field; others are issues of growing importance that have not so far been given a sustained treatment. Written by leading experts, the books in the series are designed to be used on courses and in seminars, and include useful suggestions for further reading and a helpful glossary.