<![CDATA[This research aimed to develop teaching materials of sets and find out the student conceptual understanding and disposition of mathematical concept understanding. This research type was Research and Development which was according to Borg and Gall. This research began with a preliminary study in the form of a needs analysis, learning development, product design and instruments. The subject of this research was VII A class students of SMP Muhammdiyah 3 Bandar Lampung in academic year of 2015/2016 who have medium to low-level thinking. The preliminary study results indicated that there had been no teaching materials of teacher in SMP Muhammadiyah 3 Bandar Lampung. The results of research showed that teaching material able to fasilitate of mathematical concepts understanding and disposition of mathematical concepts understanding.Penelitianini bertujuan untuk mengembangkan bahan ajar himpunan dan mengetahui kemampuan pemahaman konsep dan disposisi pemahaman konsep matematis siswa. Jenis penelitian ini adalah penelitian pengembangan yang mengacu pada model Borg and Gall. Penelitian diawali dari studi pendahuluan berupa analisis kebutuhan, pengembangan pembelajaran, desain produk dan instrumen. Subjek penelitian ini adalah siswa kelas VII A SMP Muhammadiyah 3 Bandar Lampung tahun pelajaran 2015/2016 yang memiliki level berpikir menengah ke bawah. Hasil studi pendahuluan menunjukkan bahwa belum ada bahan ajar dari hasil karya guru di SMP Muhammadiyah 3 Bandar Lampung. Hasil penelitian menunjukkan bahwa bahan ajar mampu meningkatkan kemampuan pemahaman konsep dan disposisi pemahaman konsep matematis siswa.Kata kunci: bahan ajar, disposisi, pemahaman konsep]]>
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