<![CDATA[This research is quasi experimental design which to know the effectiveness of learning by open-ended approach considered by student’s critical thinking skill. The population of this research was all students of tenth grade on science program except students of excellent class students of Senior High School State 1 Way Jepara in academic years 2012/2013, which are distributed in four class. Sample of this research was students of X Science 2 and X Science 3 that was determined by purposive random sampling technique. The design of this research was posttest only control group design. The data in this research was quantitative data that was acquired by student’s critical thinking skill test which formed essay test. Based on data analysis, it can be concluded that learning of open-ended approach is effective considered by student’s critical thinking skill.Keywords: critical thinking skill, effectiveness, open-ended approach]]>
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