Electronic Theses and Dissertation

Keterampilan berpikir kritis merupakan salah satu kompetensi esensial abad ke-21 yang perlu dikembangkan melalui proses pembelajaran yang bermakna dan kontekstual. Namun, pembelajaran di sekolah masih cenderung berpusat pada guru dan berorientasi pada hasil akhir, sehingga peserta didik kurang dilibatkan dalam proses berpikir tingkat tinggi seperti menganalisis, mengevaluasi, dan memecahkan masalah. Hal ini berdampak pada rendahnya kemampuan berpikir kritis peserta didik. Tujuan penelitian ini adalah mengembangkan LKPD PBL berbasis SSI dengan pendekatan STEM untuk meningkatkan keterampilan berpikir kritis peserta didik. Penelitian ini merupakan penelitian pengembangan (Research and Development) dengan model ADDIE yang mencakup tahap analisis, desain, pengembangan, implementasi, dan evaluasi. Produk yang dikembangkan meliputi modul ajar, Lembar Kerja Peserta Didik (LKPD), dan instrumen penilaian berupa soal keterampilan berpikir kritis serta angket respons guru dan peserta didik. Desain implementasi menggunakan one group pretest-posttest design. Hasil uji kelayakan menunjukkan bahwa RPP, LKPD, dan instrumen penilaian berada pada kategori sangat layak dengan rata-rata persentase sebesar 88%. Analisis data hasil pretest dan posttest menunjukkan peningkatan keterampilan berpikir kritis peserta didik dengan skor N-Gain sebesar 0,731 yang termasuk dalam kategori tinggi. Selain itu, respons terhadap perangkat pembelajaran menunjukkan hasil yang sangat positif, yaitu 88,2% dari guru dan 84,8% dari peserta didik.
Kata Kunci: Pengembangan LKPD, problem based learning, socio-scientific issues, STEM, keterampilan berpikir kritis.

Critical thinking skills are one of the essential 21st-century competencies that must be developed through meaningful and contextual learning processes. However, learning activities in schools are still mostly teacher-centered and outcome-oriented, which limits students’ engagement in higher-order thinking processes such as analyzing, evaluating, and solving problems. This condition contributes to the low level of students’ critical thinking abilities. This study aimed to develop a PBL-based Student Worksheet integrated with SSI and the STEM approach to improve students' critical thinking skills. This research employed a Research and Development (R&D) method using the ADDIE model, which consists of five stages: analysis, design, development, implementation, and evaluation. The developed products included a teaching module, student worksheet, and assessment instruments in the form of critical thinking tests and teacher and student response questionnaires. The implementation design applied a one-group pretest-posttest design. The feasibility test results indicated that the lesson plans, student worksheet, and assessment instruments were in the "very feasible" category with an average score of 88%. The N-Gain analysis from the pretest and posttest results showed an improvement in students’ critical thinking skills with a score of 0.731, categorized as high. In addition, the response to the learning tools was very positive, with 88.2% from teachers and 84.8% from students. Keywords: Development of student worksheet, problem-based learning, socio-scientific issues, STEM, critical thinking skills.