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The preliminary results of critical thinking skills carried out on 30 junior high school students are still show a low category. Therefore, the researcher developed worksheet based on Susan Loucks Horsley as an alternative to improve students’ critical thinking skills in science learning. The research objective to determine the validity and reliability of the worksheet based on Susan Loucks Horsley. The worksheets were compiled based on Susan Loucks Horsley's four learning syntaxes which validated by three experts in the field of science learning. The data analysis technique for student worksheet validation was assessed using expert validity and content validity. Based on the results of the analysis of expert validity and content validity, the worksheets based on Susan Loucks Horsley to improve students' critical thinking skills are included in the very valid category and reliable.

Validity; reliability; critical thinking skills; worksheet; susan loucks horsley