This study is entitled The Effect of Implementing Problem-Based Learning (PBL) Model on Critical Thinking Ability of 10th Grade Students at UPT SAM Negeri 2 Palembang" The formulation of this research is to examine whether there is an effect of the Problem-Based Learning (PBL) model on the critical thinking ability of students in history subjects for 10th grade at UPT SMA Negeri 2 Palembang.. T…