This book meets the need for a book on disorders from the clinical perspective that children actively seek to acquire a phonological system for communication, rather than sets of speech sounds in particular phonetic contexts. It also recognizes that sub-groups of speech-disorderd children exist, and that intervention should take into accounts the deficits underlying different patterns of surface speech errors. The book addresses 3 key issues - the need for an eclectic classification system of speech disorders, the need for a model of the speech-processing chain motivated by developmental speech disorders, and the measurement of the efficacy of specific therapeutic approaches for sub-groups of speech disordered children. Though primarily written for student speech pathologists, the book will also be useful to experienced clinicians and other researchers may find some of the experimental studies reported valuable.