Figure 2. A learning curve indicating level of learning during the course, drawn by a student and originally commented
in Finnish (Virkki-Hatakka and Turunen 2006). The dip in the curve between the HAZOP and Safety analysis exercises,
i.e. lectures 7–9, indicates the student had a problem; the teacher must search her notes from the same lessons and try to
find a likely reason for the dip in the curve.