This research is a class action research (PTK). Implemented in two cycles. The purpose of this study is to improve the learning outcomes of natural sciences in grade IV students through the implementation of A problem-based cooperative learning model. The subject of this study is a grade IV student of elementary school consisting of 39 students.. From implementation of problem-based learning model to learning proved to improve IPA learning result, it is proven from test results in cycle I of 38.5% and test result in cycle II of 87.2%. The test results increased by 48.7%. Students have reached the due diligence with an average value of 85.12. The study concluded that the implementation of a problem-based learning model can improve the learning outcomes of SCIENCE in grade IV students in Ciheuleut State Elementary School 01 Bogor Timur District.
