“…PBL is informed of being able to improve concepts mastery, both junior high school (Zakariya, Ibrahim, & Adisa, 2016), senior high school (Yulianti, 2017), and college students (Zhang et al, 2015). Some studies also report that the application of PBL is also able to empower various students' thinking skills, such as critical (El-Shaer & Gaber, 2014;Ulger, 2018), creative (Sihaloho, Sahyar, & Ginting, 2017;Ulger, 2018), metacognitive (Adnan & Bahri, 2018), and problem-solving thinking skills (Jonassen, 2011).…”