Dropouts
We included dropouts, resembling an intention to treat analysis, by incorporating their e-test scores in the descriptive and inferential statistics. Yet, the t-test does not represent students who completed less that 2 e-tests. Participants withdrew from the trail when they ceased training with MC-Duell and/or taking e-tests. If students failed to adhere to the schedule, we encouraged them to contact the supervision. After receiving access to the missed material, they continued with the programme.