Tujuan penelitian ini adalah untuk menghasilkan media pembelajaran big book pada tematik materi tema 1 pertumbuhan dan perkembangbiakan makhluk hidup sub tema 1 perkembangbiakan dan daur hidup hewan. jenis penelitian yang digunakan peneliti adalah penelitian dan pengembangan. model penelitian menggunakan research and development yang dimodifikasi oleh borg and gall. tahapan penelitian dan pengembangan ini terdapat 10 tahap, yaitu: (1) potensi dan masalah, (2) pengumpulan informasi, (3) desain produk, (4) validasi desain, (5) revisi desain, (6) uji coba produk, (7) revisi produk, (8) uji coba pemakaian, (9) revisi produk, (10) produksi massal. teknik pengumpulan data yang digunakan adalah wawancara, observasi, lembar validasi dan angket respon peserta didik. hasil penelitian menunjukkan bahwa pengembangan media pembelajaran big book pada tematik materi tema 1 pertumbuhan dan perkembangbiakan makhluk hidup sub tema 1 perkembangbiakan dan daur hidup hewan sangat layak ditinjau dari hasil validasi ahli media diperoleh skor rata-rata 3,6 dengan persentase 90%, hasil validasi ahli materi diperoleh skor rata-rata 3,3 dengan persentase 82,5%, dan hasil angket respon peserta didik pada uji coba pemakaian mencapai persentase 100%. berdasarkan perolehan skor rata-rata dan persentase yang diperoleh maka media pembelajaran big book pada materi perkembangbiakan dan daur hidup hewan, dikatakan layak untuk digunakan. kata kunci: penelitian dan pengembangan, media pembelajaran, media pembelajaran big book

The purpose of this study was to produce a big book learning media on thematic material theme 1, growth and reproduction of living things, sub theme 1, animal reproduction and life cycle. the type of research used by researchers is research and development. the research model used a research and development modified by borg and gall. there are 10 stages in this research and development, namely: (1) potential and problems, (2) information gathering, (3) product design, (4) design validation, (5) design revision, (6) product testing, ( 7) product revision, (8) usage trial, (9) product revision, (10) mass production. data collection techniques used were interviews, observation, validation sheets and student response questionnaires. the results showed that the development of learning media big book on thematic material theme 1 growth and reproduction of living things sub theme 1 breeding and animal life cycle is very feasible in terms of the validation results of media experts obtained an average score of 3.6 with a percentage of 90%, validation results. the material expert obtained an average score of 3.3 with a percentage of 82.5%, and the results of the student response questionnaire in the use trial reached a percentage of 100%. based on the acquisition of the average score and the percentage obtained, the big book learning media on animal reproduction and life cycle material is said to be suitable for use. keywords: research and development, learning media, big book learning media