<![CDATA[This study aims to determine the process and analyze the quality of the HOTS-type test instrument development on flat side space and measure students' higher-order thinking skills. This type of research is research and development with the Formative Research (Tessmeer) model. The test subjects in this study were class XI.3 students at SMP Negeri 30 Makassar, totaling 30 students. Based on the research results, it is known that 1) the development process using the Formative Research (Tessmeer) model through 4 stages, namely the preliminary stage, the self-evaluation stage, the prototyping stage, and the field test stage. 2) the quality of test development is declared valid with a CVR (Content Validity Index) value, the average total score is 1 with a very appropriate category or is in the interval 0.68-1.00, practically based on the results of the questionnaire analysis of student responses 89.07% with the response category "Very Positive”, reliable with an average of 0.752 and 0.866 in the high category (reliable), the average difficulty level of the total score is 0.69 and 0.49 in the medium category, and the different power of the average total score is 0.42 and 0.49 in the good category. 3) students' critical thinking ability averaged 67.61, which was in the good category. Thus, this HOTS-type test instrument can be used to measure students' high-order thinking skills.]]>
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