“…Figure 8 shows that PBL research is also related to the topic of electronic learning modules (Purnamasari & Utomo, 2020;Seruni et al, 2020;Kurniati et al, 2021;Yunita et al, 2021), which is the latest topic being researched (topics marked in yellow clusters). Other recent PBL research topics are related to other topics, namely 21stcentury learning (Marshel & Fauzi, 2021;Ranggi et al, 2021;Parno et al, 2020;Saputro et al, 2020), physics (Wibowo, 2021;Parno et al, 2020), critical thinking (Marthaliakirana et al, 2022;Susanto et al, 2022;Rehmat & Hartley, 2020;Seruni et al, 2020;Saputro et al, 2020;Puspita & Aloysius, 2019;Hakim & Meidawati, 2019;Rubini et al, 2019), and scientific literacy (Amaringga et al, 2021;Parno et al, 2020;Wibowo, 2021).…”