Penerapan Teknik "Mistake Buster" Sebagai Pendekatan Berbasis Refleksi Diri Efektif dalam Meningkatkan Penguasaan Grammar Bahasa Inggris

Abstract. This report aims to investigate the effectiveness of implementing the "Mistake Buster" technique as a self-reflective-based approach in improving English grammar proficiency among 10th-grade students in Makassar. This study employs a mixed-method design, combining quantitative and qualitative data collection and analysis. The study participants consist of 30 students who underwent a 2-cycle intervention using the "Mistake Buster" technique. This intervention focuses on active student engagement in identifying and rectifying their grammar errors through self-reflection. Students are involved in various activities, such as error analysis, peer feedback, and targeted grammar exercises. Quantitative data were collected through pre and post-tests to measure the level of students' grammar proficiency before and after the intervention. The results indicate a significant improvement in students' grammar scores, demonstrating the effectiveness of the "Mistake Buster" technique in enhancing grammar proficiency. Overall, these findings suggest that the "Mistake Buster" technique, as a self-reflective-based approach, can effectively enhance English grammar proficiency among 10th-grade students. This technique encourages student engagement, self-directed learning, and collaborative problem-solving, enabling students to identify, rectify, and avoid grammar errors more effectively.. Keywords: action research, grammar proficiency, self-reflection, "Mistake Buster" technique, 10th-grade students, English language learning