Berbagai model pembelajaran dikembangkan untuk melatih kemampuan berpikir kritis siswa sehingga mampu bersaing manghadapi tantangan dunia. Penelitian ini bertujuan untuk mengetahui keefektifan pembelajaran inkuiri terbimbing dilengkapi penilaian portofolio untuk meningkatkan berpikir kritis siswa SMA. Metode penelitian ini adalah penelitian quasi experiment, dengan desain control group pre test post tes design. Kelas X4 sebagai kelas eksperimen dan kelas X5 sebagai kelas kontrol. Hasil

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... n menunjukkan rata-rata berpikir kritis siswa kelas eksperimen adalah 85,67 dan kelas kontrol adalah 75,84. Berdasarkan hasil analisis uji gain, peningkatan berpikir kritis siswa kelas eksperimen menunjukkan kriteria peningkatan yang tinggi. Hasil penelitian ini dapat disimpulkan model pembelajaran inkuiri terbimbing dilengkapi penilaian portofolio efektif untuk meningkatkan berpikir kritis siswa. Abstract Many types of learning are developed for practising critical thinking knowledge of students to make them can face world challenge. This study was conducted to know the effectiveness of guided inkuiri learning which was completed with portfolio assessment to increase critical thinking of Senior High School students. The research method that is used in this study is quasy-experimental research, which has control group pre test and post test design. There are two classess in this study, that are X4 class as experiment class and X5 class as control class. This study result shows the average of students' critical thinking in experiment class is 85,67 and control class is 75,84. Based gain analise, it shows there is an increasing of students' critical thinking in experiment class high criteria. From this result, it is concluded that inkuiri terbimbing learning that is completed with portfolio assessment is effective to increase students' critical thinking.