“…Observational data is also one of the important data sources, including video recordings of participants' training process (e.g.,Arican & Özçakir, 2021;Gundel & Piro, 2021;Kosko et al, 2022), and classroom observations (e.g.,Dieker et al, 2019;Fraser et al, 2020;Pas et al, 2016). To quantitatively assess teachers' learning achievement, some studies used scores to represent the level of learning, such as course exams and project performance(Nikimaleki & Rahimi, 2022), knowledge tests (e.g.,Arican & Özçakir, skills (e.g., Chen, 2022;Manero et al, 2022;Seufert et al, 2022), selfefficacy (e.g.,Gundel & Piro, 2021;Huang et al, 2023b;Pendergast et al, 2022), and subject knowledge and skills (e.g.,Fraser et al, 2020;Xefteris & Palaigeorgiou, 2019). Apart from research focusing on using XR-based training to facilitate learning, two studies utilised VR technologies to investigate the effect of class size on teachers'…”