<![CDATA[Collaborative Problem-Solving (CPS) is acknowledged as an essential twenty-first-century ability, as underlined by the Programme for International Student Assessment framework. However, physics examinations in schools continue to emphasize on individual cognitive accomplishment, while valid and reliable instruments for testing students' CPS skills are rare, notably in sound wave learning. As a result, the purpose of this study was to create and test a Rasch-based assessment tool for testing senior high school students' collaborative problem-solving abilities in sound wave material. This study employed a quantitative descriptive design using the Rasch measurement model. The study included 185 eleventh-grade students participating in physics lessons. The CPS instrument was created using the OECD/PISA 2015 framework and consists of three collaborative competencies: developing and sustaining common knowledge, taking appropriate action, and establishing and maintaining team organization. Data were analyzed using Winsteps software through reliability, separation, item fit, person fit, Wright map, item difficulty, and person ability analyses.The results showed that the instrument had proper measurement quality, with a Cronbach's Alpha of 0.72 and person reliability of 0.68. The majority of students' answers were in line with the Rasch model. Students performed better when it came to taking appropriate action during experimental activities, but there were problems in teamwork and collaborative reflection. Overall, the Rasch-based CPS instrument was proven to be valid and reliable in assessing students' collaborative problem-solving abilities in sound wave learning contexts.]]>
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