A key aspect when students have to work in groups in a computer supported collaborative learning context is how the groups are formed. In this article, we analyze how two types of students' characteristics might influence on the success or the failure of the collaborative learning process when students have to work in groups. Particularly, we study how students' learning styles and students' team roles might affect the performance of the team. By applying Artificial Intelligence techniques we

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... ve discovered interesting relationships among these students' characteristics and team performance. We consider that these findings can shed some light to the area of group formation in the area of computer supported collaborative learning.