Scientists and stuttering therapists present the current and confirmed findings on speech fluency disorders (stuttering and cluttering). They demonstrate that stuttering is largely hereditary, associated with structural and functional changes in the brain, and represents a neurological disorder. They dispel the notion that stuttering is caused by early childhood experiences: parents of a stuttering child have not made any mistakes in language development. The authors identify therapies that can eliminate or at least reduce stuttering, as well as therapies that may be popular but are ineffective. The book serves as a helpful guide for those affected, a comprehensive reference for stuttering therapists, and an authoritative guideline for doctors.