%I UNIVERSITAS SULTAN AGENG TIRTAYASA %X This study aims to produce teaching materials based on contextual teaching and learning, as well as to determine the feasibility and responses of students to the developed teaching materials. The research method used is Research and Development (R&D) with the ADDIE development model (Analysis, Design, Development, Implementation, Evaluation). The results of this development research show that contextual teaching and learning based teaching materials are “Very Feasible” to apply to fifth grade learning in elemtary school. This is supported by day validation by media experts, material experts, and material experts with an average result of the due diligence test of 86,3% while the students response haul obtained from the limited trial got a percentage result of 89,02% and included in the “Very Good” category. This shows that the teaching materials developed are feasible and interesting to apply to learning in order to develop an understanding of the concepts of fifth grade elementary school students on ecosystem component materia %A NOVI SOPIRAH %L eprintuntirta47647 %K teaching materials, contextual, conceptual understanding, ecosystem bahan ajar, contextual, pemahaman konsep, ekosistem. %T PENGEMBANGAN BAHAN AJAR BERBASIS CONTEXTUAL TEACHING AND LEARNING PADA PEMBELAJARAN TEMATIK UNTUK MENGEMBANGKAN PEMAHAMAN KONSEP %O Penelitian ini bertujuan untuk menghasilkan bahan ajar berbasis contextual teaching and learning, serta untuk mengetahui kelayakan dan respons peserta didik terhadap bahan ajar yang dikembangkan. Metode penelitian yang digunakan adalah Research and Development (R&D) dengan model pengembangan ADDIE (Analysis, Design, Development, Implementation, Evaluation). Hasil penelitian pengembangan ini menunjukkan bahwa bahan ajar berbasis CTL “Sangat Layak” diterapkan pada pembelajaran kelas V di SD. Hal ini didukung oleh hasil validasi oleh ahli media, ahli bahasa, dan ahli materi dengan hasil rerata uji kelayakan sebesar 86,3%. Sedangkan hasil respons peserta didik yang diperoleh dari uji coba terbatas mendapat hasil persentase sebesar 89,02% dan termasuk kategori “Sangat Baik”. Hasil tersebut menunjukkan bahwa bahan ajar yang dikembangkan layak dan menarik untuk diterapkan pada pembelajaran agar dapat mengembangkan pemahaman konsep peserta didik kelas V SD pada materi komponen ekosistem %D 2023