<![CDATA[Critical thinking skills are an important competency of the 21st century, but their implementation in science learning at elementary schools is still not optimal. Observations and tests of critical thinking skills at UPTD SDN 22 Maros Regency show that students still have difficulties in interpreting, analyzing, evaluating, and drawing conclusions, which are influenced by the use of learning media that are less interactive and supportive of critical thinking skills. This study aims to analyze the needs and develop a valid, practical, and effective prototype of the RESPIRA AR learning media in improving critical thinking skills of fifth-grade elementary school students. This study uses the Research and Development (R&D) method with the ADDIE model, which includes Analysis, Design, Development, Implementation, and Evaluation. Data was collected through validation by media and material experts, observation of media implementation, teacher and student response questionnaires, as well as critical thinking skills tests (post-test). Data analysis was carried out quantitatively using the Gregory index, Likert scale percentages, and Independent Sample t-test. The research results showed that: (1) analysis indicated the need for media development with teacher percentage 90.90%, student percentage 91.11%, and material 90%; (2) design produced a RESPIRA AR media prototype based on Augmented Reality in the form of a digital flipbook based on WebAR with 19 pages; (3) development showed the media to be highly valid with media expert percentage 93.74% and material expert 95.19%; (4) implementation showed the media to be very practical based on teacher responses 93.33% and student 90.77%; and (5) evaluation indicated the media was effective with significance value 0.000 < 0.05 and the average critical thinking skills of the experimental class (68.60) higher compared to the control class (49.32). The conclusion of this study indicates that the RESPIRA AR learning media meets the criteria of being valid, practical, and effective for improving the critical thinking skills of fifth-grade elementary school students.]]>
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