The Impact of Structured Peer Feedback on Japanese University Students’ L2 Speaking Accuracy and Fluency: A Longitudinal Classroom-Based Study

This study examined a 10-week structured peer feedback intervention in a Japanese university grammar course involving 26 first-year EFL students. Analysis of 213 peer feedback entries and PROGOS automated speaking scores showed substantial fluency gains (+63%) and moderate accuracy improvement (+31%). Questionnaire and qualitative data indicated increased error awareness, reduced anxiety, and enhanced confidence and motivation, though some students perceived fewer speaking opportunities. Overall, findings suggest that structured peer feedback fosters measurable development in fluency and accuracy while supporting affective and metacognitive growth.