<![CDATA[In order to help students in grade 11 at SMA Negeri 1 Banjarmasin strengthen their critical thinking abilities, this research is creating an electronic booklet to teach them about the coordination system. Students' lack of critical thinking abilities, stemming from antiquated and uninteresting course materials, is the root reason of this research. Research and development (R&D) using the 4D model (Define, Design, Develop, and Disseminate) was used in this study, however it was conducted with restricted scope. Two expert validators and eleventh graders from SMAN 1 Banjarmasin served as the study's subjects. Questionnaires for validation, readability, and student feedback were among the study tools used. With an average validity score of 4.65 and a feasibility score of 4.63, the E-Booklet meets the criterion of being extremely viable, according to the validation data. Students gave the content an average score of 4.58 on a reading test, suggesting that it was simple to grasp. With an average score of 4.53, students had nothing but good things to say about the E-Booklet. E-Booklet also achieved a post-use score of 92.72, which is extremely excellent, demonstrating that it improved students' critical thinking abilities. Therefore, this electronic booklet is deemed suitable for utilisation as a learning tool to bolster a fresh and efficient method of teaching and studying biology.]]>
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