Transdisciplinary thinking is crucial for addressing global challenges, yet standardized assessment tools for high school students are lacking. This study addresses this gap by developing and validating a transdisciplinary thinking scale (TTS) tailored for this demographic. Following established methodologies, the TTS was crafted through expert interviews, resulting in a 20-item scale. A pilot test with 402 senior high school students showed strong internal consistency (Cronbach’s Alpha=0.920) and a multidimensional structure: integrative thinking, inquiry skills, and collaborative problem-solving. The TTS supports existing models of transdisciplinary cognition, emphasizing it is multifaceted nature. This scale offers educators a reliable tool to assess and foster transdisciplinary thinking skills. Integrating TTS-informed pedagogies can better prepare students for the complexities of the 21st century, promoting integrative and collaborative problem-solving. Validating the TTS marks a significant advance in educational research, promoting integrative thinking essential for addressing contemporary challenges
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