Normal vowel articulations between 15 and 36 months of age

The results of a longitudinal study of normal vowel articulations are repor ted. Data were collected from four children at 15, 18, 21, 24 and 36 months of age. All phonetically transcribable vocalizations (glossable and non-gl ossable) were analysed to form an inventory of vowel types. Results of the analysis yielded a greater variety of vowel types compared to previous stud ies examining glossable utterances. The general pattern of development was less precise than the pattern previously reported for vowel accuracy studie s. Lax and tense vowels occurred in equal numbers as did front and back vow els. The advantages and clinical value of considering non-glossable vocaliz ations in the assessment of young children's articulatory abilities are dis cussed.