2022. THE EFFECT OF THE PBL LEARNING MODEL BASED ON SCIENCE, TECHNOLOGY, ENGINEERING, MATHEMATICS (STEM) ON THE COGNITIVE ABILITIES OF JUNIOR HIGH SCHOOL STUDENTS 1 BASA AMPEK BALAI TAPAN. Universe. 3, 1 (Jul 2022), 14–19. DOI:https://doi.org/10.24036/universe.v3i1.134.