<![CDATA[This quasi experimental research with 2x2 factorial design was aimed to describe interaction between the use of students worksheets and cognitive ability to students Science Process Skills (SPS); students SPS with high and low cognitive ability. Population on this research were students of grade X in odd semester at SMAN 6 Metro in the academic year 2016/2017, with X.6 and X.7as researchs sample that obtained by purposive sampling technique. Instruments used were students worksheets based SPS and conventional, pretest and posttest questions, and attitude assessment sheets. Data analysis techniques used were two path anova test and t-test. The result of hypothesis test showed that there was no interaction between the use of students worksheets and cognitive ability to students SPS; high and low cognitive ability students SPS that used students worksheets based SPS were higher than conventional students worksheets; and high cognitive ability students SPS were not significantly different with low cognitive ability using students worksheets based SPS.Penelitian kuasi eksperimen dengan desain faktorial 2x2 ini bertujuan mendeskripsikan interaksi antara penggunaan Lembar Kerja Siswa (LKS) dengan kemampuan kognitif terhadap Keterampilan Proses Sains (KPS) siswa; KPS siswa kemampuan kognitif tinggi dan rendah. Populasi dalam penelitian ini adalah siswa kelas X SMA Negeri 6 Metro Tahun Pelajaran 2016/2017, dengan kelas X.6 dan X.7 sebagai sampel penelitian dengan menggunakan teknik purposive sampling. Instrumen yang digunakan adalah LKS berbasis KPS dan konvensional, soal pretes dan postes, serta lembar penilaian sikap. Teknik analisis data yang digunakan yaitu uji anova dua jalur dan uji-t. Hasil uji hipotesis menunjukkan bahwa tidak ada interaksi antara penggunaan LKS dengan kemampuan kognitif terhadap KPS siswa; KPS siswa kemampuan kognitif tinggi dan rendah menggunakan LKS berbasis KPS lebih tinggi daripada LKS konvensional; dan KPS siswa kemampuan kognitif tinggi tidak berbeda signifikan dengan kemampuan kognitif rendah pada penggunaan LKS berbasis KPS.Kata kunci: hukum-hukum dasar kimia, kemampuan kognitif, KPS, LKS]]>
