Part 1 Basic framework of intervention: philosophy in intervention, Margaret Leahy; aspects of the anatomy and physiology of speech, Margaret Leahy and Joseph Stemple; the classification of communication disorders, Betty Byers Brown; the epidemiology of communication disorders, Pamela Enderby; the profession at work, Betty Byers Brown and John Gilbert. Part 2 Communication disorders in childhood: language disorders in children, Alan Kamhi; childhood phonological disorders, Jennifer Lambert; childhood articulatory disorders of neurogenic origin, Mata Jaffe; childhood voice disorders, Pauline Sloane; childhood stuttering, Irmgarde Horsley; cleft palate and other craniofacial anomalies in children, Jane Russell. Part 3 Communication disorders in adults: aphasia - theory-based intervention, Ruth Lesser; assessment of dysarthria - the critical prerequisite to treatment, James Abbs and Roxanne De Paul; apraxia of speech, Niklas Miller; voice disorders in adults, Joseph Stemple; adult stuttering, Margaret Leahy; surgical rehabilitation in adults, Jerilyn Logemann; conclusion: developing the science of intervention, Margaret Leahy.