<![CDATA[This study examined how integrating argumentation activities into the scientific method affects students’ argumentation skills in scientific quality and structural completeness. A quasi-experimental design using a non-equivalent control group was employed. An essay test was used to measure students' argumentation skills. Pretest results showed no significant differences between the two classes in either scientific quality or structural completeness. Pretest and posttest comparisons revealed significant improvements in both classes (p < 0.001), with greater improvements in the experimental class. Regarding scientific quality, the experimental class showed a significant shift from the misconception and non-scientific categories toward the Scientifically Acceptable category, indicating conceptual restructuring. The N-gain score for the experiment class were 0.839 (high category), for control class were 0.557 (medium category) and the intervention had a large effect (d = 0.80). In terms of structural completeness, the experimental class achieved higher levels, particularly Level 4, demonstrating the ability to construct complete arguments comprising claims, data, explanations, and supporting evidence. The N-gain score for the experiment class were 0.703 (high category), for control class were 0.303 (medium category) and a very large effect on structural completeness (d = 1.12). These findings suggest that explicitly integrating argumentation activities into the scientific method can improve both the scientific quality and structural completeness of students' arguments. This study extends previous research on argumentation-based science learning by providing empirical evidence of the value of embedding structured argumentation activities within a scientific-method learning sequence. Furthermore, it highlights the complementary dimensions of argumentation skills, emphasizing both the scientific acceptability of students' reasoning and the completeness of their argument structures. These findings underscore the importance of integrating structured argumentation activities into physics learning to foster students' scientific reasoning and argumentation skills.]]>
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