<![CDATA[Abstrak Tujuan penelitian ini mengembangkan soal-soal kemampuan penalaran matematis yang valid dan praktis. Metode penelitian yang digunakan research and development dengan model Tessmer (modifikasi Zulkardi, 2006) yang terdiri dari tahap preliminary, self evaluation, expert review dan one-to-one, small group dan field test. Penelitian ini hanya sampai pada tahap small group. Subjek penelitian ini adalah 30 orang siswa kelas X. Penelitian ini menggunakan instrumen berupa dokumen, lembar validasi, lembar komentar/saran dan prototype. Kevalidan soal dilihat dari hasil analisis penilaian validator pada lembar validasi yang menyatakan soal-soal dikembangkan baik berdasarkan konstruk, konten dan bahasa. Keterbacaan soal dilihat dari tahap one-to-one. Setelah selesai pada tahap one-to-one dilanjutkan pada tahap small group yaitu uji coba prototype II kepada 30 orang siswa SMA kelas X. Penelitian ini menghasilkan soal-soal penalaran matematis yang valid dan praktis. Kata kunci: Pengembangan Soal Kemampuan Penalaran Matematis. Abstract The purpose of this study is to develop problems of mathematical reasoning skills that are valid and practical. Research methods used research and development with tessmer model (modification Zulkardi, 2006) consisting of preliminary stages, self evaluation, expert review and one-to-one, small group and field test. This research only reached the small group stage. The subjects of this study were 30 students of class X. This study used instruments in the form of documents, validation sheets, comment sheets / suggestions and prototypes. The validity of the problem is seen from the results of the validator assessment analysis on the validation sheet that states the problems are developed both based on construct, content and language. The readability of the question is viewed from the one-to-onestage. After completion in the one-to-one stage continued in the small group stage, namely the prototype II trial to 30 students of high school class X. This research produces valid and practical mathematical reasoning problems. Keywords: Development of Mathematical Reasoning Skills.]]>
