Purpose: The late James C. Hardy completed an extensive investigation of respiratory muscle activity during speech production. The data set that resulted was probably the most comprehensive and instructive that has ever existed. One aspect of the data puzzled Hardy and caused him to question the validity of his findings and withhold his…

The authors of a research report (1999) on the diagnosis of stuttering in young children respond to a critical letter by questioning the accuracy, validity, credibility, and internal consistency of the letter writer's criticisms. The reply goes on to clarify the evaluation of stuttering-like disfluencies and single-syllable word repetitions in…

This letter critiques a research report (Ambrose and Yairi, 1999) on diagnosis of stuttering in young children, especially the methodological issues concerned with subject selection criteria that excluded borderline cases and the use of a weighting procedure to eliminate group overlap. Also noted is the failure to distinguish between stuttering…

This response to a letter (EC 627 691) critical of the authors' research report (1999) on the diagnosis of stuttering in young children defends their subject selection criteria, justifies their use of a weighted measure of stuttering-like disfluencies, and notes continuing disagreement concerning the difference between stuttering and disfluency.…

This letter to the editor comments on a 1998 article by J. S. Yaruss which proposed that classification of stuttering be adopted to foster improvement in basic understanding. The article is critiqued as failing to recognize the two major components of a stuttering event and for the author's definitions of impairment and disability as applied to…

This rebuttal of a response to the author's original article on improved classification of stuttering in the context of disability, impairment, and handicap, stresses that the model originally proposed carefully distinguishes the two major aspects of stuttering and offers definitions of impairment, disability, and handicap consistent with the…

The authors (Ingham et al.) of the original report respond to criticisms by Kalinowski et al. that they misinterpreted their data in a study of the effects of frequency-altered feedback on stuttering in four single-subject design investigations. They also address larger issues concerning altered auditory feedback procedures. (DB)