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This study aims to produce valid cognitive conflict-based interactive multimedia. This study uses the Plomp development model, which reports the results of the preliminary study and the prototyping phase. In the preliminary phase, five journals were analyzed and data were collected through teacher questionnaires. In the prototyping phase, multimedia is designed and self-evaluation is carried out and data collection is carried out through expert review questionnaires. The results of the journal analysis show that students' misconceptions about static fluid material are quite high. The results of the questionnaire show that learning is still teacher-centered, and interactive multimedia teaching materials are not yet available that can improve understanding of 4C concepts and skills. Based on the results of the preliminary research, in the prototyping phase, interactive multimedia based on cognitive conflict was designed using the Adobe Animate cc 2019 application. Interactive multimedia was arranged according to 4 syntaxes of cognitive conflict-based learning models, namely activation of preconceptions and misconceptions, presentation of cognitive conflicts, discovery of concepts and similarities, and reflection. . Each syntax is designed to improve students' conceptual understanding and 4C skills. The results of the interactive multimedia prototype self-evaluation obtained very good criteria. The results of the prototype validity test obtained a very valid category. Interactive multimedia has been valid in material substance, learning design, visual communication display, and software utilization.

Various similar primary studies report varying impacts of applying blended problem-based learning (Blended PBL) in improving students' 21st-century skills. This study aims to group similar studies on the effect of blended PBL on students' 21st-century skills in science learning through meta-analysis. In addition, studies were analyzed on variations in models, education levels, subjects, and 4C skills. There are 44 articles worth analyzing. The data was analyzed using Excel and JASP applications by presenting results in size effect values, forest plots, and published bias tests. The results of the analysis show that science learning with blended PBL improves 21st-century skills that are better at science learning than other learning (g = 0.617, 95% Cl 0.296-0.937, p < 0.001, I[superscript 2] = 96.861%). Analysis of moderator variables showed that in the variation model, level of education, subjects, and 4C skills, there was a significant effect. These findings confirm that blended PBL is efficiently used to train students' 21st-century skills in science learning.

This research aims to design immersive virtual reality with cognitive conflict to support practical learning of quantum physics. This type of research is design research through the stages of needs analysis, product design, validity test, and practicality test. The needs analysis used questionnaire sheets distributed with Google Forms and obtained from 97 students. Immersive virtual reality design was developed by utilizing the Blender and Unity applications in the form of Android Package Kit (APK) format installed on virtual reality devices. The validity test involved six experts using validity instruments, and the practicality test involved nine students using practicality instruments. The validity test results on the learning and material indicators obtained a value of 0.89 in the valid category. A validity value of 0.95 was obtained in the valid category of the media aspect indicator. The average overall practicality score of the ease of use, display, design efficiency, and benefits indicators was 92 in the very practical category. The novelty of these research results is that they combine immersive virtual reality with cognitive conflict models applied to quantum physics learning that have been tested to be valid and practical.