PART 1: **"Adult stuttering prevalence I: Systematic review and identification of stuttering in large populations"** [https://www.sciencedirect.com/science/article/pii/S0094730X24000494](https://www.sciencedirect.com/science/article/pii/S0094730X24000494) *Received 3 November 2023, Revised 23 June 2024, Accepted 11 September 2024, Available online 9 October 2024, Version of Record 20 December 2024. Version of Record: The date the finalized version of the article was made available in the journal.* Journal of Fluency Disorders, Volume 83, March 2025 These research studies have investigated different stutter-subtypes. I've attempted to visualize these subtypes - that are mentioned in these research studies - into a scientific model, see my [Google drive PDF](https://drive.google.com/file/d/1b593bbOSmOsh4EckAWHm3Kw6wvS6IqNe/view?usp=sharing)