<![CDATA[This study aimed to develop Arabic language teaching materials based on blended learning to improve students' vocabulary mastery in the eighth grade of a junior secondary school in Jambi City. The research employed a Research and Development (R&D) method using the ADDIE development model, which consists of analysis, design, development, implementation, and evaluation stages. The research subjects were 21 students. Data were collected through observation, interviews, questionnaires, and tests. The feasibility of the product was assessed by material and media experts, while its effectiveness was measured by comparing pretest and posttest scores analyzed using the N-gain formula. The findings indicated that the developed teaching materials were categorized as highly feasible based on expert validation. Furthermore, the trial results demonstrated an improvement in students' vocabulary mastery after using blended learning-based materials. The average N-gain score fell within the medium to high category, indicating that the developed product was effective in improving learning outcomes. Therefore, blended learning-based teaching materials can be utilized as an innovative alternative in Arabic language instruction.]]>
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