Kim, Suyeon. 2017. “L2 Learners' Perception of STAD and its Relationship with Learning Styles”. The Sociolinguistic Journal of Korea 25(2), 73~102. This study aims to examine the relationship among cooperative learning, L2 learning, and learning styles. To that end, I utilized Slavin's Student Teams-Achievement Divisions (STAD) and investigated how learners perceive the effect of STAD on second language (L2) learning and how the effect of STAD is associated with their learning styles. I implemented STAD in two college English conversation classes during a semester, with 44 learners completing two questionnaires and six participating in interviews. Three key findings emerged: 1) L2 learners perceived STAD as being more useful than lecture-centered classes in improving their conversational skills, promoting more active participation and interaction, and developing higher self-confidence and lower anxiety, 2) while avoidant learning styles had a significant negative correlation with students' perception, a significant positive correlation resulted with the majority of learning styles, and 3) collaborative and independent learning styles had a more significant effect on L2 students' perception of STAD than other learning styles. The results show that through cooperative learning, L2 learners are scaffolded to improve conversational skills, and STAD accommodates diverse learning styles by giving learners equal opportunities for success. This study implies that L2 learning can be maximized when teachers employ a strategy that allows learners with different learning styles to participate.