This study aimed to improve students’ writing performance in ESP subject by implementing Flipped Classroom and Collaborative activities. Classroom action research was applied as the method in this study was. According to the data obtained, 88,89% of the students experienced improvement at least 10 points compared to their initial writing product. Students active participation also improved which was shown by the average score that was above 3,0 points obtained from peer assessment rubric. Therefore, the combination of these two strategies was proven successful in improving students’ writing performance in ESP subject.
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