This module is designed to prepare teachers to facilitate the phonological aspects of language development. Section 1 provides detailed basic background information on phonology, including: (1) definition of three aspects of the phonological system (classification, intonation, and stress) with an ontogeny for each; (2) brief discussions of phonology developmental outcomes, the relevance of phonology to reading readiness and visual perception, the physiology of speech, types of developmental discrepancies in children's speech, and sociological aspects of phonology; and (3) presentation of methods for measuring phonetic development. Section 2 provides teaching strategies related to the stated learner outcomes for classification and intonation. In the last section, the competencies needed by teachers to facilitate phonology development are listed along with definitions of terms, selected readings and appropriate films. (ED)