<![CDATA[The author's concern for students, namely not being able to prove what their arguments are. The lack of student literacy so that every material related to interpreting and writing, they will have difficulty understanding and conveying their ideas into an argumentative text, is the background to this research. One effort that can be made is to apply the Number Head Together learning model in writing argumentative texts. This study aims to: 1) test the effectiveness of the Number Head Together model in writing argumentative texts for class XI SMA Negeri 1 Sukagumiwang and 2) find out how students' activities use the Number Head Together (NHT) learning model in the argumentative text writing skills of class XI students of SMA Negeri 1 Sukagumiwang. This study uses an experimental method with the True Experimental Design experimental method (a real experiment). The population of this study were all students of class XI of SMA Negeri 1 Sukagumiwang. By using the purposive sampling technique, class XI.8 was determined as the experimental class with 33 students and class XI.9 as the control class with 33 students. Research data were collected through written tests and observation sheets. Based on the results of statistical calculations using test tests, this shows that there is no difference in the average value between the initial test results of students in the experimental class and the control class. In the statistical results of the normality test of normal data and the homogeneity test, the results are homogeneous so that in the final test hypothesis test, a probability value (Sig.) Of 0.001 was obtained because 0.001 <0.05. Thus, it can be stated that the NHT learning model is effective in writing argumentative texts for class XI students of SMA Negeri 1 Sukagumiwang.]]>
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