<![CDATA[This study aims to determine the effect of implementing the 3D Conventional learning model on students’ learning outcomes in the topics of Ecology and Indonesian Biodiversity for Grade VII students at MTsN 3 Nganjuk. The background of this research is based on problems in science learning that are still dominated by lecture methods with learning media limited to textbooks and modules, causing students to experience difficulties in understanding the material and showing low learning interest. This research employed a quantitative approach using a Pre-Experimental One Group Pretest–Posttest Design, in which a single group of students was given a pretest, followed by treatment, and a posttest to determine the effect of the treatment on learning outcomes. This design was used to identify changes in students’ achievement before and after the implementation of the learning model and to measure the effectiveness of the treatment objectively through numerical data analysis and statistical hypothesis testing. The research subjects consisted of 32 students. Data were collected through pretest and posttest assessments and analyzed using the paired sample t-test with the help of SPSS version 25.0 at a significance level of 0.05. The results showed an increase in the students’ average score from 75.78 in the pretest to 92.44 in the posttest. Statistical test results indicated a Sig. (2-tailed) value of 0.000 < 0.05, meaning there was a significant difference between learning outcomes before and after the implementation of the 3D Conventional learning model. Thus, the 3D Conventional learning model proved to have a positive and significant effect on improving students’ learning outcomes. This model helps students understand concepts more concretely through activities of description, demonstration, and discussion, making learning more active, engaging, and meaningful.]]>
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