“…For example, research on the implementation of the flipped classroom at the Polytechnic of Porto, Portugal (Lopes & Soarez, 2019) reports that although the group of students participating in the flipped mathematics classroom achieved demonstrably better results at the end of the course than the other group attending a traditional lecture, students struggled to accept their new role in the flipped classroom and did not devote enough time to preparatory activities, especially in the beginning. Students of Environmental Technology at the University of Basque Country (Feniser et al, 2018) and Food Biotechnology at the University of Burgos (Rivero-Pérez et al, 2019) also assessed the online part of the course as too tiring and time-consuming. On the other hand, they highly appreciated the active involvement in the face-to-face teaching itself.…”