<![CDATA[This quasi experimental research aimed to find out the influence of guided discovery learning towards students’ adaptive reasoning ability. The population of this research was all students of grade XIPA of SMA Negeri 2 Metro in academic year of 2017/2018 with total 162 students and that was distributed into five classes. The samples of this research were students of XIPA 2 and XIPA 3 class that were chosen by purposive sampling technique. The design which used was pretest-posttest only control grup design. The data of this research were obtained by the essays test of adaptive reasoning ability. Analysis data of the research used t-test. Based on the result of the research and the data analysis, it can be concluded that guided discovery learning afffects student’s adaptive reasoning ability. Penelitian experimen semu ini bertujuan untuk mengetahui pengaruh guided discovery learning terhadap kemampuan penalaran adaptif siswa. Populasi dalam penelitian ini adalah seluruh siswa kelas XIPA SMA Negeri 2 Metro tahun pelajaran 2017/2018 dengan jumlah 162 siswa dan terdistribusi ke dalam lima kelas. Sampel penelitian ini adalah siswa kelas XIPA 2 dan XIPA 3 yang dipilih dengan teknik purposive sampling. Desain yang digunakan adalah pretest-posttest only control grup design. Data penelitian ini diperoleh melalui tes kemampuan penalaran adaptif berbentuk essay. Analisis data penelitian ini menggunakan uji-t. Berdasarkan hasil penelitian dan analisis data, diperoleh kesimpulan bahwa guided discovery learning berpengaruh terhadap kemampuan penalaran adaptif siswa. Kata kunci: guided discovery learning, penalaran adaptif, pengaruh ]]>
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