This study examined the types of roles played by students during peer response sessions and investigated how the students' roles facilitated learning. This qualitative case study involved six Grade 10 mixed-proficiency level students from a secondary school in Malaysia. Data were collected through multiple sources. The findings indicated that the students were engaged in multiple roles during the interaction sessions which stimulated their thinking skills and led to mutual learning. The findings suggest that English language curriculum needs to give due attention to students' role in the "student-centred learning approach" to empower them with independent learning.