<![CDATA[Penelitian pengembangan buku ajar berbasis proyek pada mata kuliah Program Linier ini dilatarbelakangi oleh kebutuhan akan bahan ajar yang dapat memfasilitasi pengembangan kemampuan berpikir kreatif mahasiswa melalui pendekatan pembelajaran berbasis proyek. Metode penelitian yang digunakan adalah Research and Development (R&D) dengan model pengembangan 4D yang dikembangkan oleh Thiagarajan. Subjek penelitian terdiri atas kelompok uji coba terbatas (6 mahasiswa dan 1 dosen) dan kelompok uji coba skala besar (25 mahasiswa dan 1 dosen pengampu) pada Program Studi Pendidikan Matematika UIN Sumatera Utara. Hasil penelitian menunjukkan buku ajar yang dikembangkan memenuhi kriteria valid berdasarkan penilaian ahli dengan persentase rata-rata 89%, praktis berdasarkan respon pengguna dengan persentase 90% dari dosen dan 84,89% dari mahasiswa, serta menunjukkan efektivitas awal produk yang kuat dalam meningkatkan kemampuan berpikir kreatif matematis mahasiswa, yang ditunjukkan oleh peningkatan rata-rata sebesar 35,32 poin yang teruji secara statistik melalui uji-t berpasangan (t = 20,756; df = 24; p < 0,001), dengan ukuran efek sangat besar (Cohen's d = 4,151) dan N-Gain rata-rata sebesar 0,768 (kategori tinggi). Temuan ini menjadi bukti awal bahwa buku ajar berbasis proyek dapat digunakan sebagai alternatif bahan ajar untuk memfasilitasi kemampuan berpikir kreatif matematis mahasiswa pada mata kuliah Program Linier. Kata kunci: berpikir kreatif matematis, buku ajar, pembelajaran berbasis proyek, program linier Abstract: This research on the development of a project-based textbook for the Linear Programming course was motivated by the need for instructional materials that can facilitate the cultivation of students' creative thinking skills through a project-based learning approach. The research methodology employed was Research and Development (R&D) utilizing the 4D development model developed by Thiagarajan. The research subjects comprised a limited trial group (6 students and 1 lecturer) and a large-scale trial group (25 students and 1 course lecturer) from the Mathematics Education Study Program at UIN Sumatera Utara. The findings showed that the developed textbook met the validity criteria based on expert assessment with an average percentage of 89%, was deemed practical based on user responses with percentages of 90% from lecturer and 84.89% from students, and demonstrated strong initial effectiveness of the product in enhancing students' mathematical creative thinking skills, as indicated by an average increase of 35.32 points that was statistically confirmed by a paired-sample t-test (t = 20.756; df = 24; p < 0.001), a very large effect size (Cohen's d = 4.151), and an average N-Gain of 0.768 (High category). These findings provide initial evidence that the project-based textbook can serve as an alternative instructional material for fostering students' mathematical creative thinking in the Linear Programming course. Keywords: mathematical creative thinking, textbook, project-based learning, linear programmings]]>
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