“…We searched for a variety of studies that report the use of an instrument for assessing differentiated instruction, via Scopus, ERIC, and Google Scholar, but do not claim to present an exhaustive inventory of such instruments here. In the retrieved studies, we mainly found instruments based on self-report regarding DI practice (Coubergs, Struyven, Vanthournout, & Engels, 2017;Prast, Van de Weijer-Bergsma, Kroesbergen, & Van Luit, 2015;Roy et al, 2013) and instruments for measuring the perceived difficulty of DI strategies (Gaitas & Alves Martins, 2017), teachers' attitudes towards DI (Coubergs et al, 2017), and teacher self-efficacy regarding DI (Prast et al, 2015;Wan, 2016). Furthermore, several lesson observation schemes aimed at assessing whether a teacher applies specific differentiation strategies were reviewed (Tomlinson, Brimijoin, & Narvaez, 2008;Van de Grift et al, 2011;Van Tassel-Baska, Quek, & Feng, 2006).…”