This volume brings together a collection of 18 papers dealing with the problem of word order variation in discourse. Word order variation has often been treated as an essentially unpredictable phenomenon, a matter of selecting randomly one of the set of possible orders generated by the grammar. However, as the papers in this collection show, word order variation is not random, but rather governed by principles which can be subjected to scientific investigation and are common to all languages.The papers in this volume discuss word order variation in a diverse collection of languages and from a number of perspectives, including experimental and quantitative text based studies. A number of papers address the problem of deciding which order is 'basic' among the alternatives. The volume will be of interest to typologists, to other linguists interested in problems of word order variation, and to those interested in discourse syntax.