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This research is motivated by the low results of students' critical thinking skills. The purpose of this study is to describe the improvement of critical thinking skills using the Problem-Based Learning (PBL) model on the integrated thematic grade IV SDN 03 Pakan Labuah Bukittinggi City. This type of research is classroom action research (CAR) using qualitative and quantitative approaches. The subjects of the study were the fourth grade students of SDN 03 Feed Labuah, Bukittinggi City, totaling 25 people. The study was conducted in two cycles. The results showed an increase in the average observations of the first cycle RPP was 73.60% (C) increased in the second cycle to 94.44% (AB), this was also seen in the average results of the implementation of learning aspects of the first cycle teacher was 74 99% (C) increased in cycle II to 95% (AB). In the aspect of students it is found that the average cycle I was 71.66% (C), increasing in cycle II to 93.33% (AB). While the average assessment of observations of students' critical thinking skills in the first cycle was 61.68% (C) and increased in the second cycle which was 83.45 (A-). Thus the ProbleBased Learning (PBL) model can improve critical thinking skills in integrated thematic fourth grade students at SDN 03 Feed Labuah Bukittinggi City.

Problem Based Learning (PBL) in Improving Critical Thinking in the Era of National Development