As a speech therapist and person who stutters, I have experience from BOTH sides of the therapy table. Stuttering therapy and the techniques you learn work. Speech Therapy as a profession revolves around evidence based practice and research. Just using a search engine I was able to find these peer reviewed articles you can review at your leisure. * The Relationship of Stuttering Severity and Treatment Length to Temporal Measures of Stutterers' Perceptually Fluent Speech E. Charles Healey and Peter R. Ramig Journal of Speech and Hearing Disorders, August 1989, Vol. 54, 313-319. doi:10.1044/jshd.5403.313 * Direct Early Intervention with Stuttering Some Preliminary Data Mark Onslow, Leanne Costa, and Stephen Rue Journal of Speech and Hearing Disorders, August 1990, Vol. 55, 405-416. doi:10.1044/jshd.5503.405 * Stuttering A Review of Research Findings and Theories circa 1982 Gavin Andrews, Susan Hoddinott, Ashley Craig, Pauline Howie, Anne-Marie Feyer, and Megan Neilson Journal of Speech and Hearing Disorders, August 1983, Vol. 48, 226-246. doi:10.1044/jshd.4803.226 * Measurement and Modification of Speech Naturalness during Stuttering Therapy Roger J. Ingham and Mark Onslow Journal of Speech and Hearing Disorders, August 1985, Vol. 50, 261-281. doi:10.1044/jshd.5003.261