ABSTRACT Name : Nelly Mursyidah Student Number : 1509200080034 Department/Program : English Education/Graduate Title : The Use of Student Facilitator and Explaining Strategy in Teaching Speaking Skill (An Experimental Study at at the Second Grade Students of Private Senior High School Al Zahrah Bireuen) Keywords: Student Facilitator and Explaining Strategy, Teaching Speaking This research was conducted to investigate: (1) whether there is a significant difference in achievement between students who are taught by using Student Facilitator and Explaining Strategy and those who are not taught by using Student Facilitator and Explaining Strategy in teaching speaking in terms of fluency and grammar, (2) and the students’ motivation toward the use of Student Facilitator and Explaining Strategy in teaching speaking. This research was an experimental research. The population of the research is all second grade students of Private Senior High School Al Zahrah Bireuen in the academic year 2017/2018. The samples of the research were two customize classes from the population by using random sampling. Each class consists of 25 students. The experimental class was XIb and control class was XIc. The instruments used to collect the data were test and questionnaire. The data from the test were analyzed by using SPSS 23 to find the t-test score between two classes, experimental and control classes. The data from the questionnaire were also analyzed by using SPSS 23 to find the students’ responses toward the use of Student Facilitator and Explaining Strategy of experimental class. The result of data analysis shows that: (1) Student Facilitator and Explaining Strategy is more effective to improve students’ speaking skill in terms of fluency and grammar, which was proven by the result of t-test, in which t-test of fluency is 2.48 and grammar is 3.84 are higher than t-table (2.01); (2) the students had a quite positive responses (80%) toward the use of Student Facilitator and Explaining Strategy in teaching speaking in terms of fluency and grammar. Therefore, it could be concluded that Student Facilitator and Explaining Strategy effectively improved students’ achievement in speaking skill in terms of fluency and grammar.