<![CDATA[This research was aimed to describe the practicality, effectiveness, and effect size of discovery learning model to improve the students elaboration thinking skill on buffer solution topics. This research used poor experimental method with one group pretest-posttest design. The sample of the research was class XI MIPA 2 of SMAN 1 Gedong Tataan which was taken by cluster random sampling. Practicality was measured by implementation of discovery learning model and students response. Effectiveness was measured by basis of teacher ability, students activity, and the students elaboration thinking skill and effect size measurement. The results showed that discovery learning model practice, effective, and has big effect size to improve the students elaboration thinking skill on buffer solution topics.Penelitian ini bertujuan untuk mendeskripsikan kepraktisan, keefektivan dan ukuran pengaruh model discovery learning dalam meningkatkan keterampilan berpikir elaborasi peserta didik pada materi larutan larutan penyangga. Penelitian ini menggunakan metode poor experimental dengan one group pretest-posttest design. Sampel yang digunakan dalam penelitian ini adalah kelas XI MIPA 2 SMAN 1 Gedong Tataan menggunakan teknik cluster random sampling. Kepraktisan ditentukan berdasarkan keterlaksanaan model discovery learning dan respon peserta didik. Keefektivan ditentukan berdasarkan kemampuan guru, aktivitas peserta didik, dan kemampuan berpikir elaborasi peserta didik dan uji ukuran pengaruh. Berdasarkan hasil penelitian menunjukkan bahwa model discovery learning praktis, efektif, dan memiliki pengaruh yang besar dalam meningkatkan keterampilan berpikir elaborasi pada materi larutan penyagga.Kata kunci: discovery learning, keterampilan berpikir elaborasi, larutan penyangga]]>
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