Abstrak
This research was conducted for address a few of issues existing in students' speaking ability while learning English at SMK Gema Nusantara Bukittinggi. The problems were the students' fear of being judged badly when speaking English, difficulties in pronunciation, and limited vocabulary. To overcome the issues, reflective teaching method was used in aimed to determine wether there was significant affects of this method to students' speaking ability. The research was convened by using quantitative method and a quasi-experimental design. The population consisted of eleventh-grade students of SMK Gema Nusantara Bukittinggi and purposive sampling was used to select XI Farmasi 3 to be an experimental class (given treatment) and XI Farmasi 1 as the control class (no treatment). Data were obtained from pre-tests and post-tests administered to both classes. SPSS 23 was used to test the normality, homogeneity, reliability, and t-tests for hypothesis testing. The results compared to the t-table in level significance of α = 0.05. The findings get three key outcomes: first, there is a significant effect of reflective teaching method towards students' speaking ability, it shows by the t-calculated value for the class experiment, the pre-test post-test are greater than the t-table value (-14.267 -2.064) ; second, there is a significant difference of speaking ability between students who instructed with reflective teaching method and without reflective teaching method, it indicates by the t-calculated value for the post-test of experimental and control classes are greater than the t-table value (2.394 > 2.008) ; and third, the average of post-test score improvement in class experiment is greater than the control class (11.28 > 4.59). It proves that reflective teaching method is effective in improving students' speaking ability.