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Constructivism approach is one of the studentcentered learning approaches, students actively build their own knowledge. Social constructivism views that students build new knowledge through their interactions and activities in the classroom, as well as the mediation role of cultural settings and discussion in which the knowledge construction occurs. The purpose of this research is to provide a pattern of analysis of students' knowledge construction using Transcript-based Lesson Analysis (TBLA) through Lesson Study for Learning Community. The method of this research is qualitative descriptive. This research involves students from Secondary School who are taught by a science teacher who is used to following lesson study activities. The learning activities were audio and video recorded. Then the recorded data were transcribed and analyzed. Dialogue analysis related to the students' knowledge construction was analyzed using TBLA that divided a learning process into several segments. The result shows that the profile of students' knowledge construction patterns in science learning consists of 3 segments, namely segment 1 which has a circulation pattern, segment 2 which has a circulation pattern and socialization of the last segment 3 which follows the circulation pattern, socialization and simulation. The role of teacher's questions and students' interaction help students to construct their knowledge.

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Kemampuan Proses Sains (KPS) penting bagi setiap individu sebagai modal dasar untuk menyelesaikan permasalahan hidupnya dalam kehidupan sehari-hari. Penelitian ini bertujuan untuk mengetahui  persentase  tingkat  penguasaan  keterampilan  proses sains (KPS) siswa kelas XI MIPA 1 SMA Negeri 2 Wonogiri dalam pelaksanaan praktikum titrasi asam basa. Teknik  pengambilan  sampel  dengan  cara purposive  sampling. Subjek penelitian ini adalah siswa kelas XI MIPA 1 SMA Negeri 2 Wonogiri sebanyak 31 siswa. Penelitian dilakukan menggunakan deskriptif kualitatif dengan pendekatan fenomenologi. Metode yang digunakan untuk mengumpulkan data dalam penelitian adalah observasi, wawancara, angket, dan dokumentasi. Data dianalisis dengan analisis deskriptif. Hasil penelitian menunjukkan bahwa keterampilan proses sains siswa kelas XI MIPA 1 SMA Negeri 2 Wonogiri pada materi titrasi asam-basa termasuk kategori sedang dengan rata-rata keseluruhan persentase 62,5%.

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