<![CDATA[Abstract: This study aims to develop and assess the validity and practicality of the Napande Textbook based on Culturally Responsive Teaching (CRT) for Phase B science material. The research employed a Research and Development (R&D) method using the ADDIE model. Instruments included validation sheets from material, media, language, and cultural experts, as well as practicality questionnaires for teachers and students. The results show that the textbook is highly valid, scoring 93.75%, 88.1%, 100%, and 100%. Practicality was also very high, with a teacher score of 98.44% and student score of 88.86%, thus, the textbook is feasible and ready for classroom use. Keyword: Textbook, CRT, Phase B Science, Validity, Practicality Abstrak: Penelitian ini bertujuan mengembangkan serta menilai validitas dan kepraktisan Buku Ajar Napande berbasis Culturally Responsive Teaching (CRT) pada materi IPA Fase B. Metode yang digunakan yaitu penelitian dan pengembangan (R&D) dengan model ADDIE. Instrumen mencakup lembar validasi ahli materi, media, bahasa, budaya, serta angket kepraktisan guru dan siswa. Hasil penelitian menunjukkan buku ajar sangat valid dengan skor 93,75%; 88,1%; 100%; dan 100%. Kepraktisan memperoleh nilai sangat tinggi, yaitu 98,44% dari guru dan nilai dari siswa 88,856%, dengan demikian, buku ajar dinyatakan layak dan siap digunakan dalam pembelajaran IPA Fase B. Kata Kunci: Buku Ajar, CRT, IPA Fase B, Validitas, Kepraktisan ]]>
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