Development of Description Test Instruments Based Saintific Approach to Measure Ability to Create Critical Participants in Class V Basic School

This study aims to develop a description test instrument based on a scientific approach to measure students 'critical thinking skills in grade V elementary school and to know the differences in students' critical and reliable critical thinking abilities. The type of research used is research and development that refers to the theory of Borg and Gall. The population in this study were all fifth grade elementary school students at SDN Metro Pusat cluster nusa indah. The sample was taken using simple random sampling technique, taking 2 classes from 14 classes in the population, which consisted of one class as a trial class totaling 22 students from the VB class of SD Negeri 2 Metro Pusat and one class as a sample. totaling 37 students in VA class at SD Negeri 1 Metro Pusat. Data was collected through questionnaires and test questions. The results showed that the test instruments developed were valid and reliable. Based on the assessment of 3 experts, the average is 81.75 including in the very good category. Whereas based on the results of the empirical test, 20 description questions developed were declared to be 0.90 valid and 0.989 reliability was included in the very strong category.Keywords: Critical Thinking, Description Test Instrument, Scientific Approach