Development of a critical thinking skill instrument for physics and chemistry students in higher education

Critical thinking skill is one of the essential skills needed in the 21st century. Besides being improved through a learning process, critical thinking skill also can be acquired through the evaluation. This study aims to determine the validity and reliability of a critical thinking skill instrument. The research method used is Research and Development (R&D) with the ADDIE model and a quantitative descriptive analysis. The participant of the study are fifty 2nd semester students majoring in Physics and Chemistry. This test consists of sixteen reasoned multiple-choice items. The data are collected by using test and questionnaire. Expert validation shows that this instrument is well categorized with a percentage of 90%. This result shows that the instrument is reliable with a reliability of 0.71. The implementation shows that students’ critical thinking skill is low with a score 10.1 out of 64.