This article introduces a network data set on the friendships and group work interactions among a convenience sample of 276 Czech Grade 6 students from twelve classrooms, supported by student-level demographic, literacy, motivation, and classroom communication data. Gathered longitudinally at the beginning and end of the 2021/2022 school year, the data provide a relational insight into the nature and evolution of early adolescents' friendships. Moreover, the data provide a unique relational and temporal insight into the verbal interaction of students during classroom group work. This dataset constitutes a valuable resource for educational researchers interested in studying classroom group work as well as for social network scientists studying dynamic social networks.

Department of Educational Sciences Masaryk University Arna Nováka 1 1 602 00 Brno Czechia

etanlab Bratislava Slovakia

Institute for Research and Development in Education Charles University Myslíkova 208 7 110 00 Prague Czechia

Institute SYRI Žerotínovo nám 617 9 601 77 Brno Czechia

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