<![CDATA[This study examined changes in elementary students’ critical thinking skills after learning with a Sagu Sep ethnoscience-based science worksheet. A quantitative pre-experimental study was conducted using a one-group pre-test-post-test design with 20 fifth-grade students at SD Negeri 2 Merauke, South Papua, Indonesia. Data were collected using a critical-thinking test covering five indicators: formulating problems, constructing evidence-based arguments, collecting and representing data, making logical interpretations, and evaluating information based on facts or principles. Data were analyzed using descriptive percentages and group normalized gain (N-Gain). The group mean score increased from 0.00% on the pre-test to 89.23% on the post-test, yielding an N-Gain of 0.89, categorized as high. All five indicators were in the high category, with N-Gain values from 0.85 to 1.00. The findings suggest that the Sagu Sep ethnoscience-based worksheet provided a meaningful contextual setting for students to engage in scientific reasoning and critical-thinking activities. The study contributes empirical evidence for integrating South Papuan cultural knowledge into elementary science learning materials.]]>
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