The results of the implementation of problem-based student worksheets can improve students' problem-solving skills which are marked by an increase in the pretest-posttest value based on the results of the experimental class N-gain test of 0.93 in the high category, the control class N-gain value of 0.60 in the medium category. The results of the student worksheet feasibility test obtained a percentage of 98.30% indicating that the student worksheet problem-based to improve problem-solving skills and learning outcomes is very feasible to use. The problem-solving skills of students were analyzed using the N-Gain test to see the effect before and after the problem-based student worksheet was implemented. The instruments used in this study were problem-based students’ worksheets, problem-solving skills tests, and learning outcomes tests. student worksheet implementation design uses One Group Pretest-Posttest Design. This study uses a quantitative approach with a quasi-experimental research design. The purpose of this study was to identify the influence of using problem-based Student worksheets on improving problem-solving skills and student learning outcomes on business and energy materials. One of the 2013 curriculum imposed by the government focuses students on problem-solving skills. Problem-solving skills are the needs of students in the 21st century so they are deemed necessary to have. In short, the instrument based on Javanese gamelan Ethno-STEM instruments on Vibration and Sound Waves was appropriate to improve and optimize students' HOTS.
The data analysis of the science test instrument feasibility showed that: (1) both experts’ and practitioners’ judgment with overall score classified into a very good category and students’ response classified into good categories and (2) the reliability test showed a correlation coefficient of 0.8 so that it was declared as reliable. The learning expert validation sheets, practitioner validation sheets, student questionnaires, and student ability test results were used in this particular research. The sample in this study was 24 students of VIII grades.
The development research referred to the Thiagarajan 4-D (Four-D) development model with define, design, develop, and disseminate. The study aimed to develop an ethno-STEM-based HOTS science test instrument for Javanese gamelan musical instruments for junior high school students. Ethno-STEM is appropriate to accommodate High Order Thinking Skills (HOTS).
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