<![CDATA[The purpose of this study was to determine the effectiveness of guided-inquiry model on critical thinking skills and problem solving about material changes in the environment. This research was done by using quasi-experiment with post-test only design. Besides, this research used four research classes that are the experiment two class which is given the treatment of guided-inquiry model and control two class which is given the treatment of conventional model. The population used in this study was tenth grade students of science major at SMAN 2 Ngaglik, that is chosen randomly. Data collection techniques used are test and observation. The results showed that the guided-inquiry model improved critical thinking and problem solving skills. This is based on the results of test data analysis which shows a significant difference between students in the experimental class and student class control.]]>
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