Keyword: collaborative learning

ABSTRACT: Online collaborative conversation is one of the crucial approaches to promote students’ collaborative skills and cognitive development. Students’ social roles in collaborative learning have a key impact on the process of collaborative learning activities and the
development of students’ cognition. What are the differences in the cognitive structures and processes between rotated-role and fixedrole in students’ groups? This paper explored this question by empirical research. The results of epistemic network analysis showed that the rotated-role groups had more high-level cognition and more complex cognitive structure, while the fixed-role groups had more management activities. In the rotated-role groups, the leaders can better mobilize the atmosphere, organize, and coordinate the cognitive processes of the team, to contribute more to the collaborative conversations. The cognitive depth and efficiency of fixed-role groups significantly decreased over time. These imply that in online collaborative conversation activities, role-rotation can be used to promote higher-order cognitive development, and fixed role can be used to improve management efficiency. Teachers should encourage team leaders to take on more cognitive activity organization and coordination tasks in online collaborative conversation activities. In the later stages of online collaborative conversation activities, teachers should strengthen intervention and support for fixed social role groups.