So, did it work? This study (17 page PDF) of Vietnamese English-learners showed that the use of AI-powered speaking practice tools exceeded the expected improvement in proficiency. Some caveats though. The cohort size of 240 in a narrow context doesn't allow a lot of generalization. Also, the application of AI in Vietnamese classrooms needed to take into account "cultural factors such as face-saving concerns and respect for authority, as well as structural issues within the education system." So the changes to pedagogy created by the adoption of AI may themselves be a significant factor, as they counter the impact of "limited class time, large class sizes and lack of confidence (that) significantly hinder speaking skill development... H. T. Nguyen's concept of the 'silent classroom phenomenon'."
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