Development of Student Activity Sheets for Problem Based Learning to Train Critical Thinking Skills on Acid-Base Solutions Phase F Material

Penelitian ini bertujuan untuk mendeskripsikan kevalidan, kepraktisan, dan keefektifan Lembar Aktivitas Peserta Didik Problem Based Learning untuk melatih keterampilan berpikir kritis pada materi larutan asam-basa fase f. Penelitian ini adalah penelitian dan pengembangan dengan jenis penelitian Research and Development (R&D) dengan model pengembangan 4D (Define, Design, Develop, Dessiminate) yang dibatasi hanya sampai tahap develop. Uji coba produk dilakukan pada 36 peserta didik kelas XI SMA Negeri 1 Sukodadi, Lamongan. Analisis data menggunakan metode deskriptif kuantitatif. Kriteria kevalidan di lihat dari validitas isi memperoleh skor dan validitas perangkat memperoleh skor dengan modus 5 untuk ketiga LAPD sehingga dikategorikan sangat valid. Kriteria kepraktisan diperoleh dari hasil observasi aktivitas relevan sebesar 97,60% dan aktivitas tidak relevan sebesar 2,40%, keterlaksanaan model pembelajaran memperoleh peningkatan di setiap pertemuan dari 85% hingga 95% dan respon peserta didik memperoleh presentase rata-rata 94,93% sehingga dapat membuktikan kepraktisan dari LAPD yang dikembangkan. Kriteria keefektifan diperoleh dari hasil pretest-posttest keterampilan memperoleh n-gain dalam kisaran 0,5 hingga 0,9 yang menandakan peningkatan dalam keterampilan berpikir kritis peserta didik dan pengetahuan peserta didik yang mengalami peningkatan dari rata-rata pretest 56,1 menjadi rata-rata posttest 98,6. Maka dapat disimpulkan bahwa Lembar Aktivitas Peserta Didik yang dikembangkan valid, praktis dan efektif.

Kata Kunci : LAPD, Problem Based Learning, Berpikir Kritis, Asam-Basa, Pretest, Posttest.

This study aims to describe the validity, practicality, and effectiveness of the Problem Based Learning Student Activity Sheet to train critical thinking skills on the material of f-phase acid-base solutions. This research is a research and development with the type of Research and Development (R&D) with a 4D development model (Define, Design, Develop, Disseminate) which is limited to the develop stage. The product trial was conducted on 36 students of class XI of SMA Negeri 1 Sukodadi, Lamongan. Data analysis used quantitative descriptive methods. The validity criteria are seen from the content validity obtaining a score and the device validity obtaining a score with a mode of 5 for the three LAPDs so that they are categorized as very valid. The practicality criteria are obtained from the results of observations of relevant activities of 97.60% and irrelevant activities of 2.40%, the implementation of the learning model increases at each meeting from 85% to 95% and student responses obtain an average percentage of 94.93% so that it can prove the practicality of the LAPD developed. The effectiveness criteria were obtained from the results of the pretest-posttest of the n-gain skills in the range of 0.5 to 0.9 which indicated an increase in students' critical thinking skills and students' knowledge which increased from an average pretest of 56.1 to an average posttest of 98.6. So it can be concluded that the Student Activity Sheet developed is valid, practical and effective.

Keywords: LAPD, Problem Based Learning, Critical Thinking, Acid-Base, Pretest, Posttest