This series is the first to approach the problem of language disability as a single field. It attempts to bring togeth,er areas of study which have traditionally been treated under separate headings, and to focus on the common problems of analysis, assessment and treatment which characterize them. Its scope therefore includes the specifically linguistic aspects of the work of such areas as speech therapy, remedial teaching, teaching ofthe deaf and educational psychology, as well as those aspects of mother-tongue and foreign-language teaching which pose similar problems. The research findings and practical techniques from each of these fields can inform the others, and we hope one of the main functions of this series will be to put people from one profession into contact with the analogous situations found in others. It is therefore not a series about specific syndromes or educationally narrow problems. While the orientation of a volume is naturally towards a single main area, and reflects an author's background, it is editorial policy to ask authors to consider the implications of what they say for the fields with which they have not been primarily concerned. Nor is this a series about disability in general. The medical, social, educational and other factors which enter into a comprehensive evaluation of any problems will not be studied as ends in themselves, but only in so far as they bear directly on the understanding of the nature of the language behaviour involved. The aim is to provide a much needed emphasis on the description and analysis oflanguage as such, and on the provision of specific techniques of therapy or remediation. In this way, we hope to bridge the gap between the theoretical discussion of 'causes' and the practical tasks of treatment-two sides oflanguage disability which it is uncommon to see systematically related. Despite restricting the area of disability to specifically linguistic matters-and in particular emphasizing problems of the production and comprehension of spoken language-it should be clear that the series' scope goes considerably beyond this. Forthe first books, we have selected topics which have been particularly neglected in recent years, and which seem most able to benefit from contemporary research in linguistics and its related disciplines, English studies, psychology, sociology and education. Each volume will put its subject matter in perspective, and will provide an introductory slant to its presentation. In this way, we hope to provide specialized studies which can be used as texts for components of teaching courses, as well as material that is directly applicable to the needs of professional workers. It is also hoped that this orientation will place the series within the reach of the interested layman-in particular, the parents or family of the linguistically disabled.