Smith's 1973 model of articulatory phonological development between the ages of two and four is re-examined in an attempt to develop a model that includes the possibility of both perceptual and articulatory learning. Smith's data, regarding phonological transformations of words after rules established by his infant son's pronunciation of the words…

Reports on a longitudinal study of the relationship between productive phonological ability and awareness in children under the age of six. The study followed 45 subjects with variant productive phonology levels from the mean age of 3 years, 6 months to 6 years, 0 months. As a child matures in productive phonology, accompanying exponential growth…