>Speech-language pathology has its roots in elocution (speech perfection) stemming from the 18th century in England. In the United States, an emphasis on elocution continued but quickly shifted to a focus on communication disorders with the publication of a book by Samuel Potter, MD, which describes several types of speech and language disorders. Speech production continued to be the focus in the field, however, and the American Academy of Speech Correction was established in 1926. Many WWII soldiers returned with brain injury resulting in a dramatic increase in persons with aphasia. During the 1940’s and ’50s, speech-language pathology researchers and practitioners began to focus more on “mentalism” or brain processing abilities. Also during this time, brain studies, technological advances, and development of standardized testing procedures gave rise to more useful receptive and expressive language assessment and treatment techniques. The field of speech pathology became speech-language pathology during this time. During the 1960’s through the ’80’s, advances in linguistic studies further enhanced the speech-language pathologist’s understanding and ability to treat a variety of language delays and disorders in persons of any age. In the 21st century, speech-language pathologists have begun to research and treat the pragmatic use of language along with the other areas of communication disorders, which have been addressed as the profession continues to develop in the United States. SLP has hitherto developed for only less than 100 yrs and at the birth of it,it was mainly applied to researching aphasia induced from WWII for those poor soldiers.And it obtained an epic shift until 50s,so you can now understand why stutter seems not gaining much 'tractions' from SLPs and yeah the developments of SLP are not handsome enough to solve various speech disorders. I quoted all of the abovementioned statements from the Wikipedia and you can seek for more informations from it,not a hard work to finish. Also yeah stutter was discovered to be relevant to neurological diversities decades ago and SLPs are struggling to teach PWS how to manage and even eradicate stutter and even British Stammering Association is offering 'I'm a PWS!' membership certificates for PWS to enjoy privileges over living aspects that they never enjoyed before.