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This study was motivated by students’ low proficiency in writing persuasive texts, particularly in developing ideas, constructing arguments, and producing well-organized compositions. It aimed to improve students’ persuasive writing skills through the implementation of the brainwriting technique in Indonesian language learning. The study employed classroom action research based on the Kemmis and McTaggart model and was conducted in two cycles. The participants were 32 students from Class VIII-A of SMP Negeri 1 Kalibawang. Data were collected through observations of student engagement and assessments of written texts based on five aspects: content, organization, language, vocabulary, and mechanics. The findings revealed an increase in student engagement from 56.25% in Cycle I to 93.75% in Cycle II. Students’ average writing scores also improved from 61.63 at baseline to 74.91 in Cycle I and 80.50 in Cycle II. Learning mastery increased from 0% at baseline to 53.13% in Cycle I and reached 96.88% in Cycle II. These improvements indicate that the implementation of brainwriting contributed positively to student participation and the development of persuasive writing skills. Therefore, this technique can be adopted as an alternative collaborative learning strategy to support idea generation and improve students’ writing quality. ABSTRAK Penelitian ini dilatarbelakangi oleh rendahnya keterampilan menulis teks persuasi siswa, khususnya dalam mengembangkan gagasan, menyusun argumentasi, dan menghasilkan tulisan yang terstruktur. Penelitian bertujuan meningkatkan keterampilan menulis teks persuasi melalui penerapan teknik brainwriting dalam pembelajaran Bahasa Indonesia. Penelitian menggunakan metode penelitian tindakan kelas berdasarkan model Kemmis dan McTaggart yang dilaksanakan dalam dua siklus. Subjek penelitian adalah 32 siswa kelas VIII-A SMP Negeri 1 Kalibawang. Data dikumpulkan melalui observasi keaktifan siswa dan penilaian hasil tulisan berdasarkan aspek isi, organisasi, bahasa, kosakata, dan mekanik. Hasil penelitian memperlihatkan peningkatan keaktifan siswa dari 56,25% pada siklus I menjadi 93,75% pada siklus II. Rata-rata nilai menulis juga mengalami perkembangan dari 61,63 pada kondisi awal menjadi 74,91 pada siklus I dan 80,50 pada siklus II. Ketuntasan belajar meningkat dari 0% menjadi 53,13% dan mencapai 96,88% pada siklus II. Peningkatan tersebut menunjukkan bahwa penerapan brainwriting berkontribusi positif terhadap keterlibatan siswa dan pengembangan keterampilan menulis teks persuasi. Dengan demikian, teknik ini dapat digunakan sebagai alternatif strategi pembelajaran kolaboratif untuk mendukung proses pengembangan ide dan peningkatan kualitas tulisan siswa.
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Harningsih et al. (2026) studied this question.
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