To determine whether or not a modified delayed auditory feedback would smooth the speech pattern and increase fluency in stutterers, eight severe stutterers were given individual 10 to 40 hour speech sessions. Feedback was delayed by .2 seconds, the rate of speech controlled by the experimenter, and speech patterns were smoothed by prolonging vowel sounds and shortening consonant sounds. The success rate of speech fluency was 100% to the time of the report; no subjects still stuttered after a 10 month elapse. It is felt that stutterers depend on feedback for speech guidance and that the middle ear mechanism many be a factor in the cause of stuttering. (JM)