“…Furthermore, this learning model uses a real-life problem as a basis to train students to solve the problems they face (Liu, 2017;Setyawan, Aznam, Paidi & Citrawati, 2020). It supported by Simanjuntak, Hutahaean, Marpaung and Ramadhani (2021), Suastra, Ristiati., Adnyana and Kanca (2019), Yetri, Koderi, Amirudin, Latifah and Apriliana (2019) and Yuberti, Latifah, Anugrah, Saregar, Misbah and Jermsittiparsert (2019) research which shows that the PBL is effective in improving students' PSS in physics material. However, during the COVID-19 pandemic, the learning system was done online; thus this learning model was called 'Online Problem Based Learning (OPBL).'…”