<![CDATA[The low level of students' critical thinking and argumentation skills has attracted attention. This study aims to analyze the improvement of students' critical thinking skills by implementing argumentation-based assessment as an innovative learning strategy. The method used is a quantitative descriptive study involving 28 grade XI MIPA students, using essay tests and questionnaires as data collection instruments. Data were analyzed descriptively and inferentially through N-gain calculations and paired t-tests to measure the improvement of critical thinking skills. The results showed an increase in critical thinking skills from the poor and sufficient categories in the pre-test stage to good and very good categories in the post-test stage, with an average N-gain of 55% which is included in the moderate category and a paired t-test significance value <0.05 which indicates a significant difference. These findings demonstrate the effectiveness of argumentation-based assessment in developing critical thinking skills while contributing to the development of relevant contextual learning strategies to improve scientific literacy and meet the demands of 21st-century competencies.]]>
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