<![CDATA[The formulation of the problem in this study is 1) What is the process of implementing learning using the Problem Based Learning (PBL) model assisted by the WA group to improve science learning outcomes on the material of the human respiratory system in class VIII F students of SMP Negeri 1 Ngluwar even semester of the 2020 academic year/ 2021? 2) How much has the learning outcomes of Natural Sciences material on the human respiratory system increased after learning using the Problem Based Learning (PBL) model assisted by the WA group in class VIII F students of SMP Negeri 1 Ngluwar even semester of the 2020/2021 academic year? 3) What are the changes in behavior accompanying the increase in natural science learning outcomes on the human respiratory system after being given Problem Based Learning (PBL) model learning assisted by the WA group in class VIII F students of SMP Negeri 1 Ngluwar even semester of the 2020/2021 academic year? The purpose of this classroom action research is to describe the process of implementing learning using the WA group-assisted Problem Based Learning (PBL) model to improve science learning outcomes, describe the increase in science learning outcomes, and the changes in behavior that accompany the increase in science learning outcomes in the material of the human respiratory system after being taught using the WA group-assisted Problem Based Learning (PBL) model in class VIII F students of SMP N 1 Ngluwar even semester of the 2020/2021 academic year. The method used is a class action research method with two cycles, each consisting of four stages, namely planning, implementing, observing, and reflecting. Based on the results of the study it was concluded that 1) The process of implementing learning using the Problem Based Learning (PBL) model can increase student activity 2) There is an increase in learning outcomes, namely the average value in cycle 1 is 68 to 76 in cycle 2 after learning is carried out using the Problem Based Learning model (PBL); 3) The use of the WA group-assisted Problem Based Learning (PBL) model can increase behavior change, namely discipline behavior, cooperation, and responsibility that accompanies increased learning outcomes.]]>
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