Coordination is a syntactic construction which occurs in most languages. In the past, it has been a fruitful area of research, but also a controversial one. Arguments from coordination have been used in support of transformations, and against phrase-structure rules, but also in support of phrase-structure rules and against transformations. This book gives a detailed critical survey of the major accounts of coordination that were available when this book was first published in 1987, and will be of interest to students of language and linguistics.