The students who used the links (35.79% of the students) were asked to mark their usefulness on a scale from 1
(not useful at all) to 4 (very useful), the mean is 3.00. The hint buttons were used by 81.05% of the students and the mean value of the usefulness is 3.29 (on the same scale as before). 70.68% of the students used the offered definitions page, the mean of usefulness is at 2.99 and 65.26% used the results page with a mean of 3.11.