Second-language “Immersion” school programs that have been developed in Canada and the United States during the last two decades are described and the results of evaluative research pertaining to them are reviewed. Major Immersion program alternatives (i.e., Early, Delayed, and Late variants) along with their theoretical bases and pedagogical characteristics are described first. Research findings are then discussed with respect to the impact of participation in an Immersion program on the students' native-language development, academic achievement, second-language proficiency, and on their attitudes and second-language use. Also, the suitability of Immersion in different geographical/social settings and for students with distinctive, potentially handicapping characteristics is considered. It is concluded that second-language Immersion programs are feasible and effective forms of education for majority-language children with diverse characteristics.