This engaging, accessible, and comprehensive textbook introduces the full range of communication disorders that affect speech and language as well as underlying sign systems of sensation, movement, and social cognition. The content is visible, audible, observable, comprehensible, compelling and accessible. It is technology and media rich. It is accessible through easily comprehended stories but encyclopedic in coverage and thoroughness. This course book and its accompanying media rich materials in DVD and web-rich formatting (including links to webcasts as well as videos and illustrations to be included on the DVD) cover the full range of communication disorders as they affect human sign systems. The DVD includes a digital, searchable, user-friendly version of the complete text (in an Adobe Acrobat .pdf file). Each chapter ends with discussion questions, annotated recommended readings (drawn from our extensive selected bibliography), and is linked to a set of intensive multiple choice questions that are presented in a separate Appendix in two forms: one without answers that may be used in teacher-made tests, and another with answers that may be used as a study-guide and check system by students. The end material includes an extensive and complete glossary of technical terms with succinct but accurate definitions as well as a complete index of authors, terms, and important topics covered throughout the book. In addition, on the DVD PowerPoint summaries for classroom use are provided for every chapter.