“…According to several reviews, to be more effective, the PD content should focus on content knowledge of the subject the teacher is teaching (Cordingley et al, 2015;Darling-Hammond et al, 2017;Horvers et al, 2020;Postholm, 2012;Van Veen et al, 2011). However, focusing only on content is not enough (Hubers et al, 2020;Kennedy, 2016). Pedagogical content knowledge, concerning knowledge about how to support students in learning about the subject matter, needs to be included in the PD (Cordingley et al, 2015;Darling-Hammond et al, 2017;Dogan et al, 2016;Horvers et al, 2020;Postholm, 2012;Van Veen et al, 2011).…”