This study aims to examine the effect of the Roundtable Technique on students’ writing ability in descriptive text among eighth-grade students at SMP Negeri 12 Pematangsiantar. This research employed a quantitative approach with a quasi-experimental design involving two groups: an experimental group and a control group, each consisting of 32 students. Data were collected through pre-test and post-test instruments administered to both groups. The findings revealed that the mean score of the experimental group increased significantly from 63.69 in the pre-test to 84.81 in the post-test, while the control group showed a smaller improvement from 70.34 to 80.30. The result of the t-test (t = 5.032) exceeded the t-table value (1.694) at the 0.05 significance level, indicating a statistically significant difference between the two groups. These results confirm that the Roundtable Technique has a significant positive effect on improving students’ writing skills, particularly in producing descriptive texts. Therefore, this technique is recommended as an effective collaborative learning strategy in teaching writing.
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