Very few people are aware of the significant negative impact that cluttering -- a communication disorder that affects a person's ability to speak in a clear, concise and fluent manner -- can have on one's life educationally, socially and vocationally. Although different from stuttering, it is often related to this more well-known disorder. This book treats cluttering as a serious communication disorder in its own right, providing an in-depth examination of the critical factors surrounding its assessment, treatment and research. Using evidence-based data as well as information regarding the assessment and treatment of cluttering within the field of speech-language pathology, the volume includes the latest research findings and work from leading cluttering experts, worldwide. Current viewpoints regarding cluttering, along with substantiated evidence are provided. Research findings are presented regarding the nature and neurology of cluttering. A range of assessment and treatment methodologies are described in the context of disorders that may co-occur with cluttering, such as autism spectrum disorders, learning disabilities, Down syndrome and stuttering. Future directions with regards to the definition, teaching and researching of cluttering are also addressed. Clinicians, faculty members, researchers, students in the field of speech pathology, and those who clutter, alike, will find this book an essential and unique source of information on cluttering.