This article is fairly well written with a good "Conclusion" and "General Summary". I am very curious what you intend to get out of a "line by line detailed summary" when the author provided a very good summary. We do not need to reinvent the wheel to get information from research articles. **Conclusions:** "Whereas past interest in stuttering subtypes did not produce reliable and clinically practical results, the recent rise of interest in this area, seen in the few studies just reviewed and in the central importance of the topic in the program of the 2012 World Congress on Fluency Disorders, is encouraging. We note that the persistent-recovered subtypes have received the greatest research attention during the current century and that positive findings were reported. Most of the recent studies, however, were too small in scope (e.g., 14 participants in each of the Foundas et al., 2004, and the Chang, et al., 2005, studies) and should be viewed with due caution. Larger in scope investigations integrating multiple domains, should be more promising." **Summary:** "There is a burgeoning body of knowledge of epidemiology of stuttering with reference to the six areas discussed in this article. Whereas the early part of the 21st century has seen significant new information in all six areas, **most consequential have been the advances in genetics and, potentially, the diverse developmental paths of the disorder during early childhood**. Recent data on incidence and prevalence also reinforce findings regarding the large numerical disparity between these paths: Recovery and persistency. With further advances in these areas, and **with additional contributions from genetics, the 21st century may well witness, within a decade or two, very significant progress in our ability to predict risk of persistent stuttering.** Data on the incidence and high prevalence of stuttering in **preschool age children** **call for upgraded preparations of clinicians for working with this age group**, including initial evaluation and prognosis of risk for persistency, parent counselling, as well as for treatment of children considered to be at risk. In spite of the fact that sooner or later many children experience natural recovery, their initial large number also requires greater availability of clinical services. **Technological advances in genetic analyses and brain imaging, coupled with improved data from large long-term behavioral studies, are yielding rich information on onset, incidence, prevalence, developmental pathways, and subtypes.** It is through the integration of a wide spectrum of studies that we can better understand the disorder of stuttering.