This study provides an evaluation of the quality of immersion instruction in English as a second language in the Mele-Maat School, an English-medium, British-administered Polynesian school in Vanuatu, an independent South Pacific nation. The study consisted of one year of baseline data gathering and a second year for replication using standardized tests, observations, video- and audiotaping, interviews with students and teachers, student case studies, and oral and written language sample assessments by panels of U.S. language experts. The effectiveness of the Tate System of English Language Instruction used throughout the South Pacific and based on the empiricist or naturalistic theory of language learning was specifically addressed. Findings indicated that Mele-Maat students' oral and written English was of acceptable, understandable quality by U.S. standards and that their listening and reading achievement was outstanding. (MSE)