<![CDATA[AbstrakPenelitian ini bertujuan untuk mengembangkan Lembar Kerja Siswa (LKS) saintifik berdasarkan indikator keterampilan berpikir kritis. LKS dikembangkan menggunakan model 4D, yang direduksi menjadi 3D, dengan desain penelitian one group pre-test post-test design. Kegiatan penelitian diimplementasikandalamdua kali replikasi padapembelajaran IPA di kelas V SD Negeri Brodot I, Kabupaten Jombang. Hasil penelitian menunjukkan LKS memenuhi kriteria validitas dan ke-efektifan. Tingkat reliabilitas dan validitas LKS masing-masing menunjukkan rata-rata persentase 86,35% dan 92,64%. Kriteria saintifik menunjukkan peningkatan n-gain lebih dari 0,70 pada indikator menanya dan menanggapi pertanyaan, sedangkan nilai n-gain berkriteriatinggi untuk keterampilan berpikir kritis ditunjukkan oleh indikator analisis dan perumusan variabel percobaan. Keterbacaan LKS diukur menggunakan uji rumpang (cloze procedure) yang menunjukkan persentase 95,38%. Pada penelitian ini aktivitas siswa dominan pada kegiatan mengerjakan LKS dan melakukan percobaan ilmiah. Berdasarkan temuan-temuan penelitian dapat disimpulkan bahwa LKS yang dikembangkan layak untuk melatihkan kemampuan saintifik dan keterampilan berpikir kritis. AbstractThis research aims to develop Student Worksheet (LKS) scientifically based on indicators of critical thinking skills. LKS was developed using a 4D model, which is reduced to 3D, with a one-group pre-test post-test design design. The research activity is implemented in two replication on science lesson in Grade V of SD Negeri Brodot I, Jombang Regency. The results show that LKS meet the criteria of validity andeffectiveness. The level of reliability and validity of LKS respectively shows the average percentage of 86.35% and 92.64%. The scientific criterion shows an increase of n-gain over 0.70 in the indicator of questioning and responding to the question, while the highn-gain value for critical thinking is indicated by the analysis indicator and the formulation of experimental variables. LKS legibility was measured using a cloze test indicating a 95.38% percentage. In this study the student activity is dominant in the activities of doing the LKS and conducting scientific experiments. Based on the findings of the study it can be concluded that the developed LKS is feasible to trained scientificability and critical thinking skills.]]>
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