“…It may, for example, be the case that two students with the same level of school behavior evaluate their behavior differently -one as excellent, the other, only as good (Vonkova, Bendl, & Papajoanu, 2017). Evidence for differential use of scale has been a long-term concern, not only in education research (Buckley, 2009;Chen, Lee, & Stevenson, 1995;Vonkova, Zamarro, & Hitt 2018) but also in other social sciences research Bago d'Uva et al, 2011;Kapteyn, Smith, & van Soest, 2007;King et al, 2004;Vonkova & Hullegie, 2011). Thus, even though questionnaires offer a relatively cheap and easy way to obtain large-scale data about school discipline, their results must be interpreted with caution (for a summary of strengths and weaknesses of questionnaires see Table 8).…”