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Miftahul Khaira. Nim 2318.011, “The Effect of Implementation of Group Work Toward Students’ Speaking Ability at the Eighth Grade in MTsN 1 Pasaman”. English Education Department, Faculty of Tarbiyah and Education, State Islamic University (UIN) of Bukittinggi, 2023. Speaking is one of the crucial English skills for everyone, especially for the students. Speaking as a medium of communication exchanges information, ideas, feelings with others. Otherwise, the speaking skill of students are relatively low. It can bee seen when the researcher observed the students speaking ability by the teachers book score and interview of the teacher and the students. Based on the problem, it raised an idea to conduct the teaching speaking by the implementation of group work to help the students improving their speaking ability. The purpose of this research was to investigate the effect of Implementation of Group Work Toward Students’ Speaking Ability. This research was conducted to the eighth grade in MTsN 1 Pasaman. Then, the researcher used quantitative method with quasi experimental design by comparing two classes. The subject of this study was the eighth grade, specifically VIII.2 and VIII.3. VIII.2 was control class by 37 students and VIII.3 was experimental class by 36 students. In the collecting the data, test wich consisted of pre test and post test were applied. The data was analyzed by using T- Test Formula. From the result and accounting the pre test and post test scores of the experiment class and control class, there are three results. First, it was found that the t- calculated (8.335) was higher than the t- table (1.994) with degree of freedom (df) = 70 and level of significant was 0,05. So, the alternative hypothesis (Ha) was accepted, which means that there was a significant effect of the implementation of group work toward students’ speaking ability. Second, there was significant differences in students’ speaking ability who are taught by implementation of group work and those who are taught without group work. It was obviously proven by the fact that value of t-calculated was greater than t-table (5.627 > 1.993) with the degree of freedom (df) was 71. Third, it was found that the students’ speaking ability taught by group work is better than students’ who are not taught by group work. It was obviously proven by the fact that the improvement of mean score of experimental class was higher than the mean score of control class (18,12 > 8,17).