For introductory courses in communication sciences and disorders   A clear, comprehensive introduction to communication sciences and disorders, with an evidence-based, lifespan perspective.    This text provides a thorough introduction to communication sciences and disorders designed for undergraduate-level students. The new Fifth Edition continues the evidence-based, lifespan perspective. It reviews and explains the most recent research evidence pertaining to the assessment and treatment of communication disorders from birth through the end of life in a clear, comprehensible fashion. Each chapter is concise, yet provides comprehensive information appropriate for an introductory-level text.  Students gain a basic foundation in the areas of anatomy and physiology of the speech and hearing mechanisms, and an overview of the various disorders that affect voice, fluency, articulation, language, cognition, swallowing, and hearing, along with detailed descriptions of the varying etiologies that cause these impairments.    The authors describe specific evaluation procedures and tools for each disorder, and discuss efficacious management approaches and techniques for both child and adult populations. Case studies, evidence-based practice summary boxes, video examples, and technical and photographic illustrations are featured in each chapter as a means to maximide the student's learning experience. In addition, Check Your Understanding and thought questions are also provided in each chapter to ensure student comprehension of information.