Buku ajar merupakan bahan tertulis dalam bentuk lembaran-lembaran kertas yang dijilid dan diberikan cover, yang menyajikan ilmu pengetahuan yang disusun secara sistematis. Tujuan dari penelitian ini yaitu untuk mengembangkan buku ajar yang valid, efektif dan praktis. Pada penelitian ini menggunakan model penelitian 4D yang terdapat 4 tahapan yaitu, pendefinisian, perancangan, pengembangan, dan penyebaran. Buku ajar ini telah divalidasi oleh beberapa para ahli yaitu, ahli desain media, ahli bahasa, ahli materi dan ahli desain pembelajaran. Ada 3 uji coba dalam penelitian ini yaitu, uji coba perorangan, uji coba kelompok kecil,dan uji coba kelompok besar. Berdasarkan persentase gabungan kevalitan buku ajar membaca menulis permulaan (MMP) menurut para ahli diperoleh persentase sebesar 84,66% dikategorikan (sangat valid). Kepraktisan buku ajar membaca menulis permulaan (MMP) diukur melalui lembar keterlaksanaan RRP yang dilakukan pada uji coba kelompok besar pertemuan 1sebesar 90,52% dan uji coba kelompok besar pertemuan 2 sebesar 91,57% dikategorikan (sangat praktis). Keefektifan diperoleh dari uji coba kelompok besar dengan persentase 95,33% dikategorikan (sangat efektif). Berdasarkan dari data hasil tersebut dapat disimpulkan bahwa buku ajar membaca menulis permulaan (MMP) pada kelas 2 SDN Brakas Dajah 1 Bangkalan layak untuk digunakan. Kata Kunci: Buku ajar, Membaca menulis Permulaaan (MMP), Model Pengembangan 4D

Textbook was a written material which formed as a bound of many sheets of paper and it also had a cover, and serving systematically arranged science. This research aimed to develop a valid, effective, and practical textbook. This research on four-dimension model had four steps, which were: define, design, development and disseminate. This textbook had been validated by few professionals, they were: professionals of media design, language, and materials. There were 3 trial testing group, which were: individual, small and large group. Based on validation percentage of combination about beginning reading and writing (MMP) textbook which was according to the professionals was 84.66% (very valid). Practicability of beginning reading and writing (MMP) textbooks was measured through worked RPP, and that was done by small and large trial testing group. And both of them were 90.52% and 91.57% (very practical). Effectiveness was gained by thorough student response results from individual, small and large trial testing group, and was amount of 95.33% (very effective). Based on this data result, we could take a conclusion that beginning reading and writing (MMP) textbook for students grade II at SDN Brakas Dajah I Bangkalan was very reasonable to be used. Keywords: Textbook, Beginning Reading and Writing (MMP), 4D Model

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