“…For coding the mentor teachers' utterances (see column 4 in Table 1), a category system developed by Crasborn et al (2008) was used by three independent raters. This system distinguishes 15 overt mentoring skills: showing attentive behaviour (1), asking an open starting question (2), asking for concreteness (3), summarising feeling (showing empathy) (4), summarising content (5), showing genuineness (6), completing sentence/clarifying question (7), confronting (giving feedback, summarising inconsistencies, utilizing the here and now) (8), generalising (asking for similar situations) (9), helping in making things explicit (10), helping in finding and choosing alternatives (11), asking for something new (12), giving information (13), giving opinion/assessing (14), and giving advice/ instruction (15).…”