<![CDATA[This research is motivated by the low scientific literacy skills of elementary school students, indicated by students' difficulties in understanding scientific concepts and relating them to phenomena in the surrounding environment. This condition is compounded by the suboptimal use of digital learning media in the learning process. To overcome this problem, a Heyzine-based illustrated digital storybook was developed with a Problem Based Learning (PBL) approach on the topic of Climate and Its Changes. This study aims to determine the development process, feasibility level, user response, and improvement of students' scientific literacy. The method used is Research and Development (R&D) with the ADDIE model which includes the stages of analysis, design, development, implementation, and evaluation. The research subjects consisted of material experts, media experts, linguists, and fourth-grade students in small and large-scale trials. Data were collected through observation, interviews, questionnaires, and scientific literacy tests, then analyzed quantitatively using the N-Gain test. The results showed that the developed media was very feasible with a validation score of 0.97 from material experts, 0.95 from media experts, and 0.91 from linguists. Student responses reached 92% in small-scale trials and 91% in large-scale trials, while teacher responses reached 100%, all of which were categorized as very practical. Students' scientific literacy skills increased with an N-Gain value of 0.50 in the moderate category. Thus, Heyzine-based illustrated digital storybooks with a PBL approach are feasible and quite effective in improving the scientific literacy of fourth-grade elementary school students. ABSTRAK Penelitian ini dilatarbelakangi oleh rendahnya kemampuan literasi sains siswa sekolah dasar yang ditunjukkan oleh kesulitan siswa dalam memahami konsep sains dan mengaitkannya dengan fenomena di lingkungan sekitar. Kondisi tersebut didukung oleh belum optimalnya penggunaan media pembelajaran digital dalam proses pembelajaran. Untuk mengatasi permasalahan tersebut, dikembangkan buku cerita digital bergambar berbasis Heyzine dengan pendekatan Problem Based Learning (PBL) pada materi Iklim dan Perubahannya. Penelitian ini bertujuan mengetahui proses pengembangan, tingkat kelayakan, respons pengguna, dan peningkatan literasi sains siswa. Metode yang digunakan adalah Research and Development (R&D) dengan model ADDIE yang meliputi tahap analysis, design, development, implementation, dan evaluation. Subjek penelitian terdiri atas ahli materi, ahli media, ahli bahasa, serta siswa kelas IV pada uji coba skala kecil dan besar. Data dikumpulkan melalui observasi, wawancara, angket, dan tes literasi sains, kemudian dianalisis secara kuantitatif menggunakan uji N-Gain. Hasil penelitian menunjukkan bahwa media yang dikembangkan sangat layak dengan skor validasi ahli materi 0,97, ahli media 0,95, dan ahli bahasa 0,91. Respon siswa mencapai 92% pada uji coba skala kecil dan 91% pada uji coba skala besar, sedangkan respons guru mencapai 100%, yang seluruhnya termasuk kategori sangat praktis. Kemampuan literasi sains siswa meningkat dengan nilai N-Gain 0,50 pada kategori sedang. Dengan demikian, buku cerita digital bergambar berbasis Heyzine dengan pendekatan PBL layak digunakan dan cukup efektif untuk meningkatkan literasi sains siswa kelas IV sekolah dasar. ]]>
