An auditory discrimination procedure was used in this study to attempt to correct the speech problem of a 4-year-old girl. The major characteristic of that speech problem was the consistent use of inappropriate first consonant sounds in some words, like "gog" for "dog." The child was given 25 training sessions and two posttraining sessions. The first three training sessions involved ascertaining which of 45 stimulus words the subject mispronounced. The 13 words so ascertained were used later in the study. Sessions four and five involved a visual match exercise. Sessions 12 through 15 paired the visual stimuli of the previous exercises with the sounds they represented. Sessions 16 through 25 introduced a fading technique to eliminate the visual stimuli and transfer control of the discrimination to the auditory stimuli. Beginning at the end of sessions eight through 11, the l3 mispronounced words obtained in the first three sessions were introduced as stimulus items. It was found that the child's ability to discriminate "auditorially" between her response and the correct response improved over the sessions but that this discriminative ability did not appear to affect her verbal inability to correctly pronounce the stimulus words. (WD)