Describes the Envelope Vowel Approximation System (EVAS), a foreign language pronunciation learning system which allows students to see as well as hear a pedagogical model of a sound, and to compare their own utterances of that sound to the model as they pronounce the same sound. (Author/CMV)

This is the first half of a two-part study of psychopedagogical problems in the language laboratory. A study of technical problems will follow. Major attention is directed to divisions of work (unities, elements, and phases), deferred comparison, deferred master control, audio-active feedback, the acquisition of new auditive processes, elimination…