Penelitian ini bertujuan untuk menghasilkan LKS yang layak berdasarkan aspek validitas yang meliputi validasi LKS, aspek kepraktisan yang meliputi respon siswa dan keterlaksanaan pembelajaran, aspek keefektifan yang meliputi hasil tes keterampilan berpikir kritis. Jenis penelitian ini menggunakan penelitian pengembangan dengan model pengembangan Research and Development yang terdiri dari tiga tahapan yaitu pendahuluan, pengembangan dan pengujian, tetapi dalam penelitian ini dibatasi sampai pada tahap pengembangan dengan uji coba terbatas. Pengembangan LKS diujicobakan pada 15 siswa kelas VIII SMP Al Falah Deltasari. Uji coba menggunakan rancangan One Group pretest-posttest design. Data dalam penelitian ini diperoleh melalui hasil validasi, hasil angket respon siswa, hasil   pengamatan keterlaksanaan pembelajaran, dan hasil tes keterampilan berpikir kritis. Hasil kelayakan LKS berdasarkan aspek kevalidan menunjukkan bahwa LKS sangat layak digunakan. Hasil kelayakan LKS berdasarkan aspek kepraktisan yaitu hasil angket respon siswa mendapatkan skor rata-rata 88,3% dengan kriteria sangat baik dan hasil pengamatan keterlaksanaan pembelajaran menunjukkan bahwa LKS sangat layak digunakan. Hasil kelayakan LKS berdasarkan aspek keefektifan yaitu hasil tes keterampilan berpikir kritis siswa didapatkan melalui pretest dan posttest mendapatkan Gain 0,67 dengan kriteria sedang. Oleh karena itu, LKS berbasis inkuiri untuk melatihkan keterampilan berpikir kritis siswa layak digunakan dalam proses pembelajaran.

Kata kunci:   Lembar Kerja Siswa, Inkuiri, Keterampilan Berpikir Kritis, Materi Suhu dan Perubahannya.

This study aims to produce feasible work sheets based on the validity aspect which includes validity of LKS, practicality aspect which includes student response and implementation of learning, effectiveness aspects that includes student responses and critical thinking skills test results. This research used research development with the development design of Research and Development which consists of three stages, namely the introduction, development and testing, but in this study is limited to the development phase with a limited trial. The development of worksheets was tested on 15 students of class VIII of Al Falah Deltasari. Trial used a design One Group pretest-posttest design. The data in this study were obtained through validation, results of the student response questionnaire, observation the implementation of inquiry learning, and test' critical thinking skills of students. Results of LKS eligibility based on the validity aspect shows that LKS is very feasible to use. Results LKS feasibility based on aspects of practicality that is results of the questionnaire responses students get an average score of 88.3% with very good criteria and results of observations on the implementation of learning show that worksheets are very feasible to use. Result of LKS feasibility based on aspects of the effectiveness test critical thinking skills students obtained through pretest and posttest to get 0.67 gain with moderate criteria. Therefore, inquiry-based student work sheets to train students' critical thinking skills deserve to used in the learning process.

Keywords:  Student Work Sheet, Inquiry, Critical Thinking Skills, Temperature Material and Changes

Penelitian ini bertujuan untuk menghasilkan LKS yang layak berdasarkan aspek validitas yang meliputi validasi LKS, aspek kepraktisan yang meliputi respon siswa dan keterlaksanaan pembelajaran, aspek keefektifan yang meliputi hasil tes keterampilan berpikir kritis. Jenis penelitian ini menggunakan penelitian pengembangan dengan model pengembangan Research and Development yang terdiri dari tiga tahapan yaitu pendahuluan, pengembangan dan pengujian, tetapi dalam penelitian ini dibatasi sampai pada tahap pengembangan dengan uji coba terbatas. Pengembangan LKS diujicobakan pada 15 siswa kelas VIII SMP Al Falah Deltasari. Uji coba menggunakan rancangan One Group pretest-posttest design. Data dalam penelitian ini diperoleh melalui hasil validasi, hasil angket respon siswa, hasil   pengamatan keterlaksanaan pembelajaran, dan hasil tes keterampilan berpikir kritis. Hasil kelayakan LKS berdasarkan aspek kevalidan menunjukkan bahwa LKS sangat layak digunakan. Hasil kelayakan LKS berdasarkan aspek kepraktisan yaitu hasil angket respon siswa mendapatkan skor rata-rata 88,3% dengan kriteria sangat baik dan hasil pengamatan keterlaksanaan pembelajaran menunjukkan bahwa LKS sangat layak digunakan. Hasil kelayakan LKS berdasarkan aspek keefektifan yaitu hasil tes keterampilan berpikir kritis siswa didapatkan melalui pretest dan posttest mendapatkan Gain 0,67 dengan kriteria sedang. Oleh karena itu, LKS berbasis inkuiri untuk melatihkan keterampilan berpikir kritis siswa layak digunakan dalam proses pembelajaran.

Kata kunci:   Lembar Kerja Siswa, Inkuiri, Keterampilan Berpikir Kritis, Materi Suhu dan Perubahannya.

This study aims to produce feasible work sheets based on the validity aspect which includes validity of LKS, practicality aspect which includes student response and implementation of learning, effectiveness aspects that includes student responses and critical thinking skills test results. This research used research development with the development design of Research and Development which consists of three stages, namely the introduction, development and testing, but in this study is limited to the development phase with a limited trial. The development of worksheets was tested on 15 students of class VIII of Al Falah Deltasari. Trial used a design One Group pretest-posttest design. The data in this study were obtained through validation, results of the student response questionnaire, observation the implementation of inquiry learning, and test' critical thinking skills of students. Results of LKS eligibility based on the validity aspect shows that LKS is very feasible to use. Results LKS feasibility based on aspects of practicality that is results of the questionnaire responses students get an average score of 88.3% with very good criteria and results of observations on the implementation of learning show that worksheets are very feasible to use. Result of LKS feasibility based on aspects of the effectiveness test critical thinking skills students obtained through pretest and posttest to get 0.67 gain with moderate criteria. Therefore, inquiry-based student work sheets to train students' critical thinking skills deserve to used in the learning process.

Keywords:  Student Work Sheet, Inquiry, Critical Thinking Skills, Temperature Material and Changes