The used scales in the research instrument, i.e., the structured learning diary, have been released. The used scales are quite thorough thought and based on the research findings special interest should be given to the difficulty scale 1 (easy) – 5 (hard). The emotion / feeling scale: excited, relaxed, neutral, bored, and anxious are based on literature (Pekrun). Please see our publications and materials for more information on the used scales.