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 are generalized. (1) In word initial environments: nasals, /1/, and /h/ are not distorted; stops are not deleted, but voiceless stops are generally unaspirated; all other segments are realized as either [1] or [w], except voiced 'predental' fricatives, which are reduced to stops, and initial preconsonantal fricatives which are deleted. (2) In word final and word medial environments: word final consonants are deleted when they follow another consonant; word final or medial fricatives after syllabic nuclei are deleted if voiced, or realized as [h] if they are voiceless; word final or medial stops occurring between syllabic nuclei are reduced to glottal stop if voiceless, or deleted completely if voiced; in word final position before silence or a word which begins with a consonant, stops are generally reduced in the same manner, but to a much lesser degree. Such a study is deemed important because it provides information for further phonological research. (Author/AM)