Penelitian ini bertujuan untuk mengembangkan bahan ajar tematik pada tema Benda, Hewan, dan Tanaman di Sekitarku melalui pendekatan kontekstual kurikulum 2013 untuk siswa kelas I.
Jenis penelitian ini adalah penelitian dan pengembangan (R n D). Instrumen dalam penelitian ini adalah wawancara dan Angket.Wawancara digunakan untuk analisis kebutuhan kepada guru kelas I SDN 041 Tarakan, sedangkan angket digunakan untuk validasi kualitas bahan ajar oleh ahli materi, ahli tampilan, ahli bahasa.
Hasil dari penelitan ini adalah bahan ajar tematik pada tema benda, hewan, dan tanaman di sekitarku untuk siswa kelas I SDN 041 Tarakan. Validasi bahan ajar menggunakan instrument lembar validasi. Skor rata-rata bahan ajar yang telah divalidasi oleh ahi materi, ahli bahasa, dan ahli media diperoleh masing-masing 4,22 (sangat baik), 4,30 (sangat baik), 4,4 baik. Sedangkan uji coba menggunakan lembar catatan lapangan. Ada tiga uji coba : Uji coba perorangan, uji coba kelompok kecil, dan uji coba lapangan. Setiap uji coba mewakili siswa yang berkemampuan tinggi, sedang dan rendah. Uji coba perorangan melibatkan 3 orang siswa, uji coba kelompok kecil melibatkan 9 orang siswa, uji coba lapangan 21 siswa. Ketiga uji coba yang dilakukan mendapatkan respon yang sangat baik bagi siswa.
Dari hasil data penelitian di atas dapat disimpulkan bahwa bahan ajar tematik pada tema benda, hewan , dan tanaman di sekitarku memiliki kualitas sangat baik dan layak untuk digunakan dalam pembelajaran tematik untuk kelas I di SDN 041 Tarakan pada semester genap.

Kata Kunci: Penelitian Pengembangan, Bahan Ajar, Tematik

The aim of this research is to develop thematic learning materials on the theme Things, Animals, and Plants in My Surroundings using contextual Approach of the 2013 curriculum for 1st Graders. This study was a kind of research and development (R&D). The instruments used in the study were interview and questionnaire. The interview was used to analyze needs of the 1st grade teachers at the school, and the questionnaire was used to validate the quality of the learning materials by the material experts, linguists, and learning material designers. The final product of the research was thematic learning materials on the theme Things, Animals, and Plants in My Surroundings for 1st Graders of SDN 041 Tarakan. Validation instrument of the learning materials used the validation sheet. The scores of the material validation given by the material expert, linguists, and learning material designers were 4.22 (very good), 4.30 (very good), and 4.4 (good) respectively. The material testing was done by using field note sheets. There were three kinds of material testing, namely: individual testing, small group testing, and field testing. Each testing was represented by low, intermediate, and high-level learners. The individual testing involved 3 learners, 9 learners for small group testing, and 21 learners. The individual testing involved 3 learners, 9 learners for small group testing, and 21 learners for field testing. The three kinds of testing got very good responses from the learners. Based on the research data, it can be concluded that the developed thematic learning materials on the theme Things, Animals, and Plants in My Surroundings was suitable for the 1st Graders of SDN 041 Tarakan. Keywords: Development Research, Learning Materials, Thematic