Tersedia online di EDUSAINS Website: http://journal.uinjkt.ac.id/index.php/edusains EDUSAINS, VII (1), 2015, 97-104 Research Artikel PENGARUH PEMBELAJARAN BERBASIS MASALAH DAN PEMBELAJARAN KONTEKSTUAL TERHADAP BERPIKIR KRITIS SISWA SMP AbstractThe objectives of this research is to know the differences enhancement of students' critical thinking between problem based learning and contextual teaching and learning in SMPN 2 Simanindo di Simarmata. This research used quasi-experiment method with The Matching Pretest-Posttest Control Group Design and this research consisted of two classes. The subject of the research was the students of first grade with total number of participants were 45 by using cluster random sampling. The technique of collecting data used multiple choice reasoning test. The technique of analyzing data used normality and homogenous test, N -gain test and t-test were tested by IBM SPSS Statistics 22 and Microsoft office excel. The result of data analysis showed that there were no significant differences of the enhancement critical thinking between the students who studied by problem based learnind and contextual teaching and learning. It can be proven by the students' significant score 0.411 > 0.05, it means that was accepted and was rejected. The result of this research showed that the mean score of N -gain the students who studied by problem based learning is 0.41, meanwhile, the mean score of N -gain the students who studied by contextual teaching and learning is 0.31. The conclusion of this research is problem based learning and contextual teaching and learning can help the students to enhance the critical thinking. AbstrakTujuan penelitian ini adalah untuk menganalisis perbedaan peningkatan kemampuan berpikir kritis siswa yang belajar melalui pembelajaran berbasis masalah dan pembelajaran kontekstual yang dilakukan di sekolah SMPN 2 Simanindo di Simarmata. Penelitian ini menggunakan metode eksperimen semu dengan desain penelitian The Matching Pretest-Posttest Control Group. Siswa kelas VII (n = 45) terlibat sebagai subjek penelitian yang diambil dengan teknik cluster random sampling dan penelitian ini terdiri dari 2 kelas. Teknik pengumpulan data menggunakan dengan 15 butir soal pilihan ganda beralasan. Teknik pengolahan data melalui uji normalitas, uji homogenitas dan N-gain serta uji-t dua pihak dengan bantuan program IBM SPSS Statistic 22 dan Microsoft excel. Hasil analisis data menunjukkan tidak terdapat perbedaan yang signifikan antara siswa yang belajar melalui pembelajaran berbasis masalah dan pembelajaran kontekstual, dengan nilai signifikansi 0,411 > 0,05, yang berarti diterima dan ditolak. Hasil penelitian juga menunjukkan bahwa siswa yang belajar melalui pembelajaran berbasis masalah memiliki nilai rata-rata N-gain 0,41, sedangkan siswa yang belajar melalui pembelajaran kontekstual memiliki nilai rata-rata N-gain 0,31. Sehingga berdasarkan data penelitian tersebut, pembelajaran berbasis masalah dan pembelajaran kontekstual dapat membantu meningkatkan berpikir kritis siswa. Kata Kunci...