<![CDATA[This study aims to analyze the effect of the OIDDE (Orientation, Identify, Discussion, Decision, and Engage in Behavior) learning model on virus material on students' problem-solving and ethical decision-making abilities in class X at SMAN 2 Sampit. The background of this study is based on the dominance of teacher-centered learning, which has not optimally developed students' higher-order thinking skills and ethical awareness. This study employed a quantitative approach with a quasi-experimental design using a pretest-posttest control group design. The sample consisted of 70 students, divided into an experimental class and a control class. Data were collected through problem-solving tests and ethical decision-making questionnaires and analyzed using descriptive and inferential statistics. The results showed that the experimental class achieved a higher mean posttest score in problem-solving ability (M = 87.00) compared to the control class (M = 73.86), with a significant difference (p < 0.05). The N-Gain score in the experimental class was 64.66% (moderate category), and the effect size was very large (Cohen’s d = 2.916). In terms of ethical decision-making, the experimental class also showed higher posttest scores (M = 90.49) than the control class (M = 85.66), with a significant difference (p = 0.012 < 0.05) and a very large effect size (Cohen’s d = 2.139). These findings suggest that the OIDDE learning model has a positive effect on improving students’ problem-solving and ethical decision-making abilities. However, further studies with larger samples are recommended to strengthen the generalizability of the results.]]>
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