This new Third Edition provides a comprehensive overview of the etiology and development of stuttering and details appropriate approaches to accurate assessment and treatment. A new chapter on related fluency disorders discusses evaluation and treatment of stuttering associated with neurological disease or trauma, psychological disturbance, or mental retardation, and explains how developmental stuttering can be differentiated from these conditions. This edition also features a new chapter on preliminaries to assessment as well as new information on differential diagnosis of stuttering versus other fluency disorders. Appendices include forms for diagnosis and evaluation.