jegys Journal for the Education of Gifted Young Scientists 2149-360X Genç Bilge Yayıncılık 10.17478/jegys.602291 Other Fields of Education Alan Eğitimleri The Development of Problem-Based Learning Test Instruments for the High School Physics Problem Solving Skills https://orcid.org/0000-0001-8951-2202 Abdulfattah Ahsan Yogyakarta State University https://orcid.org/0000-0002-2486-5549 Supahar Supahar Yogyakarta State University 12 15 2019 7 4 1037 1053 08 06 2019 10 20 2019 Copyright © 2013, Journal for the Education of Gifted Young Scientists 2013 Journal for the Education of Gifted Young Scientists

Problem solving skills are an important part ofphysics learning in schools and is also useful for adapting to the environment.Problem solving skills are also a demand for education in the 21st century, sohaving this skills can help to compete in gaining experience in this all-modernworld. This study aimed to determine the feasibility of the developed testinstrument in terms of content validity and reliability. The test instrumentdeveloped was in the form of multiple choices with a total of 25 questions. Theanalysis of content validity of the test instrument was conducted using theAiken's V Coefficient. The empirical validity and reliability of testinstrument were estimated using the ClassicalTest Theory (CTT) and Item ResponseTheory (IRT). The results of this study showed that the test instrumentdeveloped was valid with Aiken's V Coefficient ranging between 0.76 to 0.95 andreliable with a reliability value according to CTT of 9.5, while the developedquestions were stated reliable according to the IRT if used by the studentswith the ability ranging between -1.2 to 3.8 in logit scale. Based on theresults of the study, the instrument developed was feasible to be used as aninstrument for testing problem solving skills.

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