“…The extent to which students had opportunities to practice negotiating during the simulation showed a significant large effect on self-efficacy for negotiating on the second, third and last measurement. As expected (e.g., Weiler, 2017), the general trend shows that the more students indicate that they had opportunities to practice negotiating during the simulation, the higher they report on self-efficacy for negotiation. This is also in line with Bandura (1997), who indicates that mastery experiences provide students with authentic proof of whether they have the necessary capacities to achieve the desired performance levels and therefore can lead to an increase in self-efficacy.…”