Book excerpt: This book provides readers with vast knowledge of practical applications, theoretical models, services and evidence-based solutions in the areas of assistive technology (AT) and augmentative and alternative communication (AAC). It aims to equip practicing clinicians, educators and students with the necessary background to use AT and AAC with their clients. This book also sheds light on the many different roles and functions of AT and AAC for a large variety of clinical populations, and suggests solutions the reader can implement immediately. Although a particular focus is set on communication disorders, described applications and resources also apply to individuals with developmental disabilities and sensory impairments. In addition to outlining most recent low and high technology, this book makes a particularly strong effort to teach general principles and guidelines for successful AT and AAC interventions regardless of what particular technology is used. This resource is a crucial addition to the bookshelf of any professional dealing with AT and/or AAC, including speech-language pathologists, special educators, occupational therapists, physical therapists, early intervention specialists, students in professional programs, users of AT or AAC, their families, and applied researchers. This is a must read for novices and seasoned professional alike.