Designed for students of speech pathology and audiology and for practicing clinicians, the text considers the nature of the articulation process, criteria for diagnosis, and classification and etiology of disorders. Also discussed are phonetic characteristics, including phonemic errors and configurational and contextual defects; and functional factors, including psychosocial influences (habit strength, environmental influences, and psychodynamic factors) and deficiencies and defects of intelligence, receptive deficit, and delayed maturation. Morphologic factors treated include congenital cleft of the lip and palate, other congential anomalies, dental malocclusions, and acquired orafacial defects; neurophysical factors include lower motor neuron dysarthria, upper motor neuron or suprasegmental dysarthria, and central dysarthria. Principles of diagnosis as well as methods and procedures of articulation training are also described. A bibliography cites 353 items. (JD)