This work will provide readers with uniquely systematic coverage of the field of speech and language pathology. Taking as its starting point the highly successful Encyclopedia of Language and Linguistics, the book comprises selected updates from the original work combined with a high proportion of newly commissioned material which together give a comprehensive overview of the state of the art in speech and language pathology. The work is the most up-to-date and detailed reference available in this field. The book addresses all main aspects related to speech and language comprehension and production, both in children and in normal adults. It also presents in a systematic way disorders of speech and language due to developmental and acquired causes, the most common forms of treatment and their degree of efficacy.