Penelitian ini bertujuan untuk menghasilkan LKPD literasi sains pada materi sistem pencernaan untuk melatihkan keterampilan berpikir kritis yang valid, praktis, dan efektif. Penelitian ini menggunakan model pengembangan 4D (define, design, develop, and disseminate), namun tahap disseminate tidak dilaksanakan. Penelitian ini diujicobakan secara terbatas kepada 16 peserta didik kelas XI MIPA 1 di SMA Negeri Jogoroto Jombang. Rancangan penelitian ini menggunakan one group pretest-posttest design. Data penelitian diperoleh melalui metode validasi, observasi, tes, dan angket. Metode validasi digunakan untuk mengetahui kelayakan LKPD yang dikembangkan berdasarkan penilaian validator. Metode observasi digunakan untuk mengamati aktivitas peserta didik menggunakan LKPD yang dikembangkan saat proses pembelajaran. Metode tes digunakan untuk mengetahui ketuntasan indikator pembelajaran yang memuat aspek keterampilan berpikir kritis dan ketuntasan hasil belajar peserta didik. Metode angket digunakan untuk mengetahui tanggapan dan respon peserta didik terhadap LKPD yang dikembangkan. Hasil penelitian dianalisis secara deskriptif kuantitatif dan kualitatif. Hasil penelitian menunjukkan bahwa (a) LKPD literasi sains yang dikembangkan berkategori sangat valid dengan perolehan skor sebesar 3,89, (b) keterlaksanaan aktivitas peserta didik saat menggunakan LKPD literasi sains memperoleh persentase skor sebesar 91,07% dengan kategori sangat praktis, (c) ketuntasan indikator pembelajaran dengan aspek berpikir kritis interpretasi, analisis, eksplanasi, dan inferensi berturut-turut memperoleh persentase sebesar 90,28%, 75%, 81,25%, dan 87,50% dengan sensitivitas butir soal berkategori sensitif, (d) peserta didik memberikan respon sangat positif terhadap LKPD literasi sains yang dikembangkan. Kesimpulan dari penelitian ini adalah LKPD literasi sains pada materi sistem pencernaan yang dikembangkan layak digunakan untuk melatihkan keterampilan berpikir kritis peserta didik.

Kata-kata kunci       : LKPD, literasi sains, keterampilan berpikir kritis, sistem pencernaan.

This research aimed to produce a scientific literacy student worksheets on digestive system to train critical thinking skills that are valid, practical, and effective. This research used 4D development model (define, design, develop, and disseminate), but disseminate stage was not carried out. This research limited trial on 16 eleventh-grade students of SMAN Jogoroto Jombang. The design of this research used one group pretest-posttest. Data of this research obtained through validation method, observation, test, and questionnaires. The validation method used to determine the feasibility of student worksheets that developed based on validators assessment. The observation method used to observe the activities of students using student worksheets that developed during the learning process. The test method used to find out the completeness of learning indicators that contain aspects of critical thinking skills and the completeness of student’s learning outcome. The questionairres method used to find out student’s responses to the student worksheets that developed. The research result were analyzed descriptively quantitative and qualitative. The result of this research showed that (a) scientific literacy worksheets that developed was categorically very valid with the score was 3,89, (b) the implementation of student activities when using the scientific literacy student worksheets obtained a score percentage of 91,07% with a very practical category, (c) the completeness of the learning indicators with critical thinking aspect interpretation, analysis, explanation, and inference  obtained percentages of 90,28%, 75%, 81,25%, and 87,50% with item sensitivity was categorically sensitive, (d) students gave a very positive response to the scientific literacy worksheets. The resume of this research showed that scientific literacy worksheets on the digestive system that developed were feasible to train student’s critical thinking skills.

Keywords      : student worksheets, scientific literacy, critical thinking skills, digestive system.