Abstract: This Classroom Action Research aims to enhance the critical thinking skills of eighth-grade students at SMP N 2 Abepura in Civic Education learning through the implementation of the Think Pair Share (TPS) cooperative model. The intervention was conducted in two cycles employing Kurt Lewin's framework. The research subjects comprised 16 students. Data were collected through Higher Order Thinking Skills (HOTS)-based written tests and structured observation sheets. Descriptive comparative analysis demonstrated gradual improvements in both students' cognitive performance and active participation. The class average score increased from 69.63 in Cycle I to 78.25 in Cycle II. The percentage of classical learning mastery advanced significantly from 68.75% (11 completed students) to 87.5% (14 completed students), thereby successfully surpassing the predetermined target indicator of 85%. Observation results also confirmed a shift from low-category dominance to high-category proficiency in the aspects of problem analysis, respecting divergent perspectives, and information retrieval. In conclusion, the implementation of the TPS cooperative model effectively improves students' critical reasoning. Keywords: Classroom Action Research, Critical Thinking, Think Pair Share. Abstrak: Penelitian Tindakan Kelas ini bertujuan untuk meningkatkan kemampuan berpikir kritis siswa kelas VIII SMP N 2 Abepura dalam pembelajaran PKn melalui model kooperatif tipe Think Pair Share (TPS). Tindakan dilaksanakan dalam dua siklus menggunakan model Kurt Lewin. Subjek penelitian berjumlah 16 siswa. Data dikumpulkan melalui tes tertulis berbasis Higher Order Thinking Skills (HOTS) dan lembar observasi terstruktur. Analisis data deskriptif komparatif menunjukkan adanya peningkatan performa kognitif dan partisipasi aktif siswa secara bertahap. Nilai rata-rata kelas meningkat dari 69,63 pada Siklus I menjadi 78,25 pada Siklus II. Persentase ketuntasan belajar klasikal siswa melonjak nyata dari 68,75% (11 siswa tuntas) menjadi 87,5% (14 siswa tuntas), sehingga berhasil melampaui indikator keberhasilan tindakan yang ditetapkan sebesar 85%. Hasil observasi juga mengonfirmasi terjadinya reduksi dominasi siswa kategori rendah menjadi kategori tinggi pada aspek analisis, menghargai perbedaan pendapat, serta pencarian informasi. Simpulannya, implementasi model kooperatif tipe TPS secara efektif meningkatkan penalaran kritis siswa. Kata kunci: Berpikir Kritis, Penelitian Tindakan Kelas, Think Pair Share
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