The purpose of this study was to understand the process of developing Uno Card learning resources to improve Arabic vocabulary comprehension and to determine their effectiveness for seventh-grade female students at the Darul Istiqomah Islamic Boarding School in Bondowoso during the 2024/2025 academic year. This study employed a research-and-development methodology based on the ADDIE model. Data were collected through observation, interviews, questionnaires, pre-tests, and post-tests. For data analysis, the researcher used an independent sample t-test, and to assess the effectiveness of the product, an N-Gain test was used. The findings of this study are: 1) The development of Uno Cards learning resources was carried out in five stages: analysis, design, development, implementation, and evaluation. The learning material achieved an overall validity score of 95.2% with a "highly valid" criterion, while the learning resources themselves achieved an overall validity score of 100% with a "highly valid" criterion. 85% of students gave this learning tool a very good rating. The calculated t-value of 7.502 was greater than the tabulated t-value of 2.002, indicating rejection of H0 and acceptance of Ha. This showed that the Uno card learning tool was effective in improving seventh-grade students' Arabic vocabulary comprehension. The average N-Gain score in the experimental class was 60.08, which falls into the "fairly effective" category according to the effectiveness criteria.
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