Speaking is one of crucial skill that must be thought in school. The fact that speaking is one of the important language skills that must be taught in seniorrr high school is undoubtable. Unfortunately, many teachers only focused on teaching grammar than teaching communication. Therefore, most of students get difficulties when the teacher asks them to practice their speaking skill. The purpose of this study is to find out how group discussion method can improve student‟s speaking ability of the eleventh grade of SMAN 1 MOJO. The research design of this study is Classroom Action Research (CAR). The subject of this study is student‟s of the eleventh grade of SMAN 1 MOJO in academic year 2019/2020. The class which consist of 34 students. The researcher used instruments to collect data. There are speaking test, scoring rubric, observation checklist, and the criteria of success. The researcher gave a treatment to students and after that conducted a test and the results of the test were calculated using scoring rubric. And the results of the test can be concluded using criteria of success. The criteria of success achieved if at least 80% students get score minimum 75, based on minimal mastery level criterion (KKM) from the English teacher. The result of data analysis showed that there was an improvement on the students speaking ability from each cycle. It was showed from the mean of pre�test was 63 with the precentage of success students only 20.5% (7 students). After the implementation of group discussion strategy, there was an improvement of the result of the students‟ mean which was 71.5 with the precentage of success students was 41% (14 students). And for the second cycle after reflection on the first cycle there was improvement of the students‟ mean which was 78,7 with the precentage of success students was 88.2% (30 students). It means that the criteria of minimum score have reached. Thus, it can be concluded mind mapping technique was successful to improve students‟ writing skill at the eleventh grade of SMAN 1 MOJO.

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