First Published in 1994. Part of the Outstanding Dissertations in Linguistics set, this title is divided into three main goals. The first is to provide evidence for the natural class of sounds comprised of front vowels, front glides and coronal consonants. The second is to show that a revised definition of the articulator feature properly characterises this natural class of sounds. The third goal is to provide a formal representation of front vowels and coronal consonants and their interaction within a nonlinear model of feature organisation. This title assumes a general knowledge of phonological theory.