Nonlinear phonology: introduction and clinical application.

The purpose of this tutorial is to introduce a recent advance in phonological theory, "nonlinear phonology," which differs fundamentally from previous theories by focusing on the hierarchical nature of relationships among phonological units. We first introduce the basic concepts and assumptions of nonlinear phonological theory and then demonstrate clinical applications of the theory for assessment and intervention. Data from a child with a severe phonological disorder are used to illustrate aspects of nonlinear theory. The data are first analyzed in terms of phonological processes in order to provide the readers with a familiar starting point for comprehension and comparison. The nonlinear frameworks are shown to provide a deeper analysis of the child's phonological system than the phonological process analyses and to lead to a more clearly defined intervention plan.