<![CDATA[Abstract The purpose of this study is to describe the thinking process of students in solving the problem of high-level thinking in accordance with predetermined indicators. The high-level thinking problem in this study refers to taxonomy bloom ie C4 (analysis), C5 (evaluation), and C6 (creation). Collaborative learning to enhance students' active role in solving high-order thinking problems. The thinking process of students in geometry in this study can be described based on van Hiele's theory. This research is a descriptive research with qualitative approach. Result of research from 23 students through collaborative learning, got 2 students according to van Hiele thinking level. The data obtained are 1 students who are in the process of thinking level 1 (analysis) and 1 student is in the process of thinking level 2 (informal deduction). Keywords: The Process of thinking, collaborative learning, van Hiele theory]]>
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