. The background to this research highlights the lack of effectiveness of the learning methods applied in class IV phase B for Catholic Religious Education (PAK) subjects in stimulating the development of students' critical reasoning. In facing this challenge, classroom action research was carried out by applying the Problem Based Learning (PBL) Learning Model. This research aims to improve students' critical reasoning abilities and achieve the set learning targets. With quantitative methods, research was carried out through two cycles. The results of the first cycle showed an increase in students' critical reasoning by 73.5%, with a number of students reaching advanced and proficient levels. The second cycle showed significant improvement, with students' critical reasoning reaching 86%. Learning outcomes also increased, with more students reaching advanced levels. The implications of these findings illustrate that the application of Problem Based Learning is effective in improving students' critical reasoning and achieving the desired learning targets.

Catholic Religious Education as one of the subjects taught at the basic education level. Religious education here takes a central role in moral education because it is only in the context of religion that a student's life experience can be seen through the lens of faith, being an experience of faith so that what is taught to students about morality will truly take root in the student's heart. This is what needs to be understood by all education actors, especially schools and teachers so that the education carried out in schools really develops students holistically. Students are expected to be skilled in applying it in everyday life, but the reality in the field is that children experience many difficulties, especially the low motivation of students to learn on my unique personal material. One of the efforts to improve student learning outcomes is the Problem Based Learning Method. As a formulation of the problem in this study, can the Problem Based Leraning Method improve the learning outcomes of grade IV Phase B students of SD Negeri 20 Sengkabang Muntik on the material I Am Personal Who is Unique in the odd semester of the 2023/2024 academic year? And how is the application of Problem Based Leraning in improving the learning outcomes of grade IV Phase B students of SD Negeri 20 Sengkabang Muntik on the material I Am Personal Unique odd semester of the 2023/2024 academic year? The purpose of this study was to improve the learning outcomes of grade IV students of SD Negeri 20 Sengkabang Muntik on the material I Am a Unique Person.  The subjects in this study were 5 Catholic grade IV students of State Elementary School 20 Sengkabang Muntik. Research activities are carried out for four months starting from the planning stage to the preparation of reports. The research procedure is carried out in four steps, namely, planning, implementation, obsercation and reflection. The data collection techniques used are observation and documentation analysis. The data analysis used is by comparative descriptive techniques that describe a learning technique with the desired results can be achieved.

This research aims to determine the increased learning outcomes in Catholic Religious Education subjects for grade 4 students at SDN 25 Talhut. This research uses a classroom research method carried out in two cycles. Each cycle consists of four stages: planning, implementation, observation, and reflection. The average score students obtained when using the PBL model in the first cycle was 69%, and in the second cycle, it was 85%, according to the research results for the two processes. If the PBL learning model is implemented well and consistently, it will improve student learning outcomes.