<![CDATA[The purpose of this research is to obtain a description about implementation Problem Based Learning model which can improve learning outcomes of student class VIII SMP Negeri 4 Palu about prism. This research type is a classroom action research which design is based of Kemmis and Mc. Taggart. This research conducted two cycles. The research result indicate that implementation Problem Based Learning model can improve student learning outcomes, which the phase are: 1) basic concept; 2) defining the problem; 3) self learning; 4) group learning; and 5) assessment. In the basic concepts phase, the teacher presenting the prerequisites material. In the defining the problem phase, the teacher displays math problems. In the self learning phase, students independently seek solutions to a given problem. In the group learning phase, the students work on the problems with the friends group. In the assessment phase, the teacher with the students conduct an assessment of the results of group discussions.]]>
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