AbstractThe purpose of this research was to investigate whether or not the use of “Roundtable Strategy†effective in teaching writing descriptive paragraph at the tenth grade students of SMA Katolik Talino Ambawang in academic year 2016/2017. This research applied a quasi-experimental design. The population of this research was XA as the experimental group and XB as the control group. The data was collected by using measurement technique with written test as the tool of collecting data. The research findings showed that the mean score of pre-test in the experimental group was 31.94, while the mean score of post -test was 67.36. On the other hand, the mean score of pre-test in the control group was 26.27, while mean score of the post-test was 53.27. The computation result by using    t-test showed the value of t-test was 6.28 with df  35 in the significance degree of 5%, t-table was 2.03011, it meant that t-test was higher than t-table. Furthermore, the effect size of treatment was 0.69 which was classified as “moderateâ€. Thus, the significant difference could be interpreted that the use of roundtable strategy was effective in increasing the students’ ability in writing descriptive paragraph.  Keywords: Descriptive Paragraph, Teaching Writing, Roundtable Strategy.   Â
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