Adjustment in study design
We originally created two more questionnaires of MC-Duell. In our initial study design, we included two more e-tests and training units (e-test 1 contained 10 further questions that, however, were not analysed since they addressed topics from an additional questionnaire). Our ambition was to investigate the app enclosed in a multimodal e-learning programme. Due to time-dependent limitations, the testing was foreshortened to only two months. Therefore, we abandoned the further test phases, as the training periods would otherwise have been too short. Students received access to the additional material after completing the posttest. In future investigations, we hope to test MC-Duell in an expanded learning programme.