Problem Based Learning is a learning model that simultaneously develops problem-solving strategies and basic knowledge and skills by placing students in an active role as everyday problem solvers. This paper discusses the effect size analysis of the Based Learning Learning Model on student learning outcomes. The research method used is descriptive research, namely the analysis of the results of publications in journals. The results of the study show that the Problem Based Learning learning model can and is very well implemented at the junior and senior high school levels and provides impact and change for students and can be used in mathematics lesson materials.