This is a report on the deviant phonological system of a 4-year-old child. Although this system is characterized by deletions, assimilations, simplifications, and distortions, there is a regularity in the system which lends itself to systematic phonological analysis. Based on an examination of sample phonological deviations, the following rules…

At vowel onset following unvoiced consonants in /h-cvc/ utterances spoken by two talkers, Fo began high and fell about seven percent in the first five centiseconds. At closure of voiced oral obstruents, Fo suddenly dipped about ten percent, remained flat, suddenly rose about twenty five percent at opening of closure, and, after vowel onset,…

Assuming that a child uses a "reduced version" of the adult phonological system, as opposed to an "imperfect" version, a phonological analysis of a five-year-old child's language is conducted. Research procedures are thoroughly described; tables and diagrams are included. (DD)