In a Spanish primary school, a second-grade teacher developed an activity to see how confident students felt to solve an easy (1st) and a difficult problem (2nd). She had only half of her group at that time (10 students).
Students’ confidence in the first problem (easy) was pointed in green, while the second (difficult) was pointed in red. The three students that thought they were less able in the second activity, explained they rated it that way, because the assignment was more difficult. However, those who rated the second task in the bigger face explained that although it was more difficult, they were going to try and do it well (in fact, they did).