“…cases we talk about a survey, where respondents represented school principals (from 70 up to 1.142 respondents), and in 5 studies the researches were questioning principals (from 80 up to 300) and also teachers (from 50 up to 600) and in 4 cases they questioned teachers only (from 74 up to 314). Descriptive statistics was always used for presentation, where in 4 cases there were t-tests used (Ross & Cozzens, 2016;Range et al, 2014;Hvidston et al, 2016;Yousaf et al, 2018), in 4 cases ANOVA (Al-Tarawneh et al, 2016;Sharief et al, 2012;Range et al, 2013;Wiyono, 2017), in two regression analysis (Ross & Cozzens, 2016;Mette et al, 2015), in two LSD tests (Sharief et al, 2012;Range et al, 2013) and in one case Shapiro-Wilk test (Ross & Cozzens, 2016) and in one a correlation (Yousaf et al, 2018). A content analysis of open questions was used in one of the study (Lochmiller & Mancinelli, 2019).…”