<![CDATA[Teaching materials currently available are mostly centred on text-book and tasks. Moreover, it is rarely implanted with 21st century skills and character values so that students find it difficult when solving problems related to life. STEM-based teaching materials developed are presented with characteristics of fluid information which is complemented by discussions, practicum, and project activities related to STEM aspects and integrated with 21st century skills (4C) and character values so that students are encouraged to be more active in solving problems. This study aims to describe characteristics and identify feasibility, readability, student responses to STEM-based physics teaching materials, integrated 21st century skills (4C), and characters. The method used in this research was Research and Development (R&D) with producers adapted from the research and development steps of Borg and Gall, which are modified into seven stages. Data collection techniques in this study were carried out in several ways, namely interviews, tests, and questionnaires placed on a likert scale. The results of the feasibility test showed that the teaching materials were in a very worthy category. The readability test results showed that the teaching materials were presenting in the class easily understood. The assessment of students’ responses to teaching materials showed an excellent category to be used by the second-year student of high school as a supporting learning source in the fluid subject learning process. <w:LsdException]]>
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