“…While this can be valuable in small case studies, it is also possible to gather and compare data across lessons, subjects and even countries. In the United States, the Measures of Effective Teaching (MET) project (MET Project, 2009; see also Kane & Staiger, 2012) collected 20,000 videotaped lessons over a period of 3 years (2010)(2011)(2012)(2013), to study the construct of teaching quality across subjects and classrooms (e.g., Blazar & Kraft, 2017;Briggs & Alzen, 2019;Campbell & Ronfeldt, 2018;Cantrell & Kane, 2013;Jensen et al, 2018;Kane & Cantrell, 2010;Schultz & Pecheone, 2014;White et al, 2022aWhite et al, , 2022b.…”