<![CDATA[Poetry-writing skills focusing on social issues among Grade X-8 students at SMA Negeri 3 Jember were initially low due to difficulties in conceptualizing ideas, choosing appropriate diction, and developing poetic imagination. This study aimed to describe the learning process and the improvement in students' poetry-writing skills on social-issue themes through the implementation of Project Based Learning (PjBL) assisted by the Social Expression Poster medium. This classroom action research was conducted in two cycles comprising planning, action, observation, and reflection phases involving 30 students. Data were collected using poetry-writing performance tests, teacher and student observation sheets, field notes, and portfolio documentation. The learning process progressed collaboratively from posing fundamental questions to publishing mini poetry anthologies, accompanied by heightened student engagement. The results revealed that the class average score increased progressively from 64.3 in the pre-cycle to 75.2 in Cycle I, and reached 83.3 in Cycle II. The classical learning mastery rate rose markedly from 20% (6 students) in the pre-cycle to 70% (21 students) in Cycle I, and achieved 93.3% (28 students) in Cycle II, surpassing the 75% success benchmark. Consequently, the application of Project Based Learning assisted by Social Expression Posters can improve students' poetry-writing skills on social issues in Grade X. ABSTRAK Keterampilan menulis puisi bertema isu sosial pada peserta didik kelas X-8 SMA Negeri 3 Jember awalnya masih rendah akibat kesulitan menemukan ide, menentukan diksi, dan membangun imajinasi puitik. Penelitian ini bertujuan untuk mendeskripsikan proses pelaksanaan pembelajaran serta peningkatan keterampilan menulis puisi bertema isu sosial melalui penerapan model Project Based Learning (PjBL) berbantuan media Poster Ekspresi Sosial. Penelitian tindakan kelas ini dilaksanakan dalam dua siklus yang masing-masing terdiri atas tahapan perencanaan, pelaksanaan tindakan, observasi, dan refleksi terhadap 30 peserta didik. Data dihimpun menggunakan instrumen tes unjuk kerja menulis puisi, lembar observasi aktivitas guru dan peserta didik, catatan lapangan, serta dokumentasi artefak karya. Proses pembelajaran berlangsung secara kolaboratif melalui tahapan penentuan pertanyaan mendasar hingga publikasi antologi puisi mini, disertai peningkatan keaktifan peserta didik di kelas. Hasil penelitian menunjukkan nilai rata-rata kelas meningkat secara bertahap dari 64,3 pada tahap prasiklus menjadi 75,2 pada siklus I, dan mencapai 83,3 pada siklus II. Peningkatan persentase ketuntasan belajar secara klasikal melesat dari 20% (6 peserta didik) pada prasiklus menjadi 70% (21 peserta didik) pada siklus I, serta mencapai 93,3% (28 peserta didik) pada siklus II sehingga melampaui indikator keberhasilan yang ditetapkan sebesar 75%. Dengan demikian, penerapan model Project Based Learning berbantuan media Poster Ekspresi Sosial dapat meningkatkan keterampilan menulis puisi bertema isu sosial peserta didik kelas X. ]]>
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