“…Students' critical thinking skill is not genetics; thus, it needs to be trained and improved through repeated practice (Hokanson, 2018). Critical thinking skill improvement must be conducted intensively (Anders et al, 2019). Students' critical thinking skills can be measured by critical thinking instrument that refers to critical thinking indicators, among others, give simple explanation, establish basic skills, draw conclusion, give further explanation, and arrange strategies and techniques (Ennis, 1985;2011).…”