We are not able to cover the entire history of phonology even from the beginning of the twentieth century. For example, we will say nothing about glossematics, firthian prosodic phonology, or stratificational theory (see Fischer-Jørgensen, 1975, for accounts of these models).1 We will only touch on the contributions of the Prague School and Jakobson’s role in developing distinctive feature theory, and on Bloomfieldian structural phonemics (again, see Fischer-Jørgensen, 1975, for more details).