While the educational literature mentions several obstacles affecting the effectiveness of collaborative learning (CL), they have often been investigated through the perceptions of only one actor, either teachers or students. Therefore, some sources of obstacles that teachers and students encounter may not have been revealed. In this study, 19 teachers and 23 students in different disciplines at a pre-service teacher education faculty at a university in Vietnam were interviewed. In total, 47% of the teachers taught science subjects and 53% taught social subjects; 35% of the students majored in science subjects, 57% in social subjects, and 8% in primary education. With regard to study cohorts, 22% of the students were in the first and second year while 78% were in the third and fourth year of their fouryear bachelor's programme. These programmes produce qualified teachers for primary and secondary schools nationwide. Based on grounded theory analysis, four common obstacles to collaboration were identified: students' lack of collaborative skills, free-riding, competence status, and friendship. Furthermore, the results showed three interrelated antecedents that contribute to these obstacles. Central to the antecedents is the strong focus of the teachers on the cognitive aspects of CL, which led the participating teachers to neglect the collaborative aspects of CL. These antecedents were demonstrated in the ways teachers set CL goals, provided instruction, and assessed student collaboration. This study may be useful for educators, designers, and researchers to foster the quality of student collaboration.

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Following earlier studies aimed at gaining a deeper understanding of digital competence through a review of literature and current digital competence frameworks, this paper focuses on experts' views on digital competence. It describes the results of a Delphi study investigating experts' ideas on what it means to be digitally competent today. The study involved two online consultations, one directed at gathering individual ideas and one directed at validating the aggregated mapping of digital competence, established through various qualitative and quantitative data analysis steps. The paper describes and discusses the final results from the Delphi study involving 95 experts from across Europe and beyond. Results indicate that digital competence is built up of knowledge, skills, and attitudes pertaining to twelve different areas. Besides, results show that several issues of debate can be identified when it comes to establishing the boundaries of digital competence.

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