PENGARUH PROBLEM BASED LEARNING TERHADAP KEMAMPUAN BERPIKIR KRITIS DAN AKTIVITAS BELAJAR SISWA

The purpose of this research was to know the influence of problem based learning model to increase students critical thinking skill and students learning activity. The samples of this research were students of VIIC and VIID SMP Perintis 2 Bandar Lampung which were chosen by Purposive Sampling technique. The research used pretest-posttest non equivalent design. The quantitative data were the learning result that were analyzed by using U-Test. The qualitative data were the observation sheet of learning activity and student responses. The result showed the increasing of students critical thinking skill by N-gain average in expreriment class (47,22)was significantly different with class control (33,91). The increasing of the average of students learning activity of experiment class was high criteria. Therefore, problem based learning model can improved critical thinking skill and students activity on the material of environmental management.Penelitian ini bertujuan untuk mengetahui pengaruh Problem Based Learning terhadap kemampuan berpikir kritis dan aktivitas belajar siswa. Desain penelitian adalah pretest-posttest tak ekuivalen. Sampel penelitian adalah siswa kelas VIIC dan VIID SMP Perintis 2 Bandar Lampung yang dipilih secara purposive sampling. Data kuantitatif diperoleh dari rata-rata nilai pretest, posttest dan N-gain yang dianalisis menggunakan uji U. Data kualitatif diperoleh melalui lembar observasi aktivitas dan angket tanggapan siswa. Hasil penelitian menunjukkan kemampuan berpikir kritis siswa mengalami peningkatan dilihat dari rata-rata N-gain kelas eksperimen sebesar 47,22 berbeda signifikan dengan kelas kontrol 33,91. Rata-rata peningkatan aktivitas siswa pada semua aspek berkriteria tinggi. Dengan demikian, pembelajaran menggunakan model PBL berpengaruh dalam meningkatkan kemampuan berpikir kritis dan aktivitas belajar siswa.Kata kunci: aktivitas belajar, berpikir kritis, problem based learnin