Abstract :
The research aimed to determine the teacher roles in implementing cooperative Learning. This research was conducted in SMA Negeri 3 Poso. The method used in this research is descriptive qualitative. The subject was teacher of SMA Negeri 3 Poso. The techniques of data collection were questionnaire and interview
The findings of the research obtains that the roles of teacher at SMA Negeri 3 Poso in implementing Cooperative Learning, which are: (1), Specifying academic and social skill objectives; (2), Deciding group size; (3), Deciding composition group; (4), Assigning roles; (5), Arranging the room; (6), Planning material; (7), Explaining academic task the objectives of the lessons; (8), Structuring the criteria for success; (9), Structuring positive interdependence, and (10), Structuring intergroup cooperation. The teachers9 plays a leading role in setting up the cooperative learning structures as well as in preparing students for the tasks and in facilitating the accomplishment of the task goals.