<![CDATA[This study aimed to develop a local wisdom-based sago plant supplementary book for the Plant Diversity course and to assess its validity, practicality, and effectiveness. The study employed a Research and Development method using the ADDIE model, which consists of analysis, design, development, implementation, and evaluation stages. Local content was obtained through morphological observations and interviews with the community in Sereh Village, Jayapura Regency. The product trial involved 25 Biology Education students from the 2024 cohort at the University of Papua. The product was validated by material and media experts, while its practicality was measured through a student response questionnaire. The effectiveness of the product was analyzed based on pretest and posttest results using the N-Gain score. The results showed that material expert validation reached 80%, categorized as valid, while media expert validation reached 98%, categorized as very valid. The test instrument achieved 100% validation, and the student response questionnaire reached 90%. Product practicality reached 95.8%, categorized as very practical. The average learning outcome increased from 72.40 in the pretest to 94.00 in the posttest, with an N-Gain score of 0.83, categorized as high. Based on the research criteria, the local wisdom-based sago plant supplementary book was valid, very practical, and effective in the trial context.]]>
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