<![CDATA[AbstrakPenelitian ini bertujuan untuk mendeskripsikan learning obstacle, mendesain bahan ajar yang valid, dan mendeskripsikan learning obstacle setelah implementasi bahan ajar. Metode yang digunakan pada penelitian ini adalah metode kualitatif dan kuantitatif. Metode kualitatif untuk analisis learning obstacle dan bahan ajar, sedangkan metode kuantitatif untuk mengetahui keseragaman pendapat. Subjek dalam penelitian ini adalah 31 siswa kelas VIII C SMP Negeri 1 Plered untuk identifikasi learning obstacle awal dan 32 siswa kelas IX A SMP Negeri 1 Plered untuk identifikasi learning obstacle dan kemampuan pemahaman matematis siswa. Desain penelitian yang digunakan berupa desain didaktis (Didactical Design Research). Hasil penelitian ini menunjukan bahwa terdapat 8 learning obstacle siswa terkait materi operasi bentuk aljabar. Validasi bahan ajar modul matematika dilakukan oleh 5 validator (3 dosen FKIP Universitas Swadaya Gunung Jati dan 2 guru matematika). Berdasarkan hasil validasi tersebut dapat disimpulkan bahwa bahan ajar modul operasi bentuk aljabar berbasis kemampuan pemahaman matematis siswa dengan model discovery learning diperoleh bahan ajar siswa layak digunakan dalam proses pembelajaran, serta bahan ajar pedoman guru layak digunakan pula.Kata Kunci: Learning obstacle, aljabar, kemampuan pemahaman matematis, desain didaktis. Designing Module Based on Discovery Learning Models for Students' Mathematical Understanding AbilityAbstractThis study aims to describe learning obstacle students, designing instructional materials, and describing learning obstacle students after the implementation of teaching materials. The method used in this study is qualitative and quantitative methods. Qualitative methods for the analysis of obstacle learning and teaching materials, while the quantitative method to find out the uniformity of opinion. The subjects in this study were 31 students of class VIII C of SMP 1 Plered to identify the initial obstacle learning and 32 students of class IX-A of SMP 1 Plered to identify obstacle learning and students' mathematical understanding skills. The research design used is in the form of didactic design (Didactical Design Research). The results of this study indicate that there are 8 learning obstacle students related to algebraic form operating material. Validation of mathematics module teaching materials was carried out by 5 validators (3 lecturers of FKIP Swadaya Gunung Jati University and 2 mathematics teachers). Based on the results of the validation, it can be concluded that the algebraic form operating module teaching materials based on students' mathematical understanding ability with discovery learning models obtained that they are suitable for learning, and the teacher's guideline teaching material also.Keywords: Learning obstacle, algebraic, mathematical understanding ability, Didactical Design Research.]]>
