“…Students have encountered a variety of teachers and teaching practices and asking them to rate these is economically applicable in the classroom (Clausen, 2002;De Jong & Westerhof 2001). It has been argued that aggregated student ratings constitute a shared (and more objective) perception of teaching practices rather than representing individual perceptions (Kunter et al, 2007;Lüdtke, Robitzsch, Trautwein, & Kunter, 2009;Lüdtke, Trautwein, Kunter, & Baumert, 2006). In terms of construct validity, Wagner, Göllner, Helmke, Trautwein, and Lüdtke (2013) showed that students are able to differentiate between theoretical criteria of instructional quality and describe their teachers' teaching practices in this respect.…”