<![CDATA[Arabic language learning in Islamic boarding schools requires instructional materials that are capable of developing students' language skills comprehensively. One of the textbooks widely used is Al-'Arabiyyah Bayna Yadaik, which is designed to improve listening, speaking, reading, and writing skills through a communicative approach. This study aims to analyze the effectiveness of using Al-'Arabiyyah Bayna Yadaik in improving the maharah lughawiyah of eighth-grade students at Diniyah Limo Jurai Islamic Boarding School, Agam. This research employed a quantitative approach using an ex post facto research design. The population and sample consisted of 53 students selected through a saturated sampling technique. Data were collected using a Likert-scale questionnaire and documentation, and subsequently analyzed using descriptive statistics and simple linear regression with the assistance of SPSS version 26. The findings reveal that the use of Al-'Arabiyyah Bayna Yadaik obtained a percentage score of 78.11%, which falls into the effective category, while the students' maharah lughawiyah achieved a percentage score of 78.89%, also categorized as effective. The simple linear regression analysis produced the equation Y = 18.649 + 3.085X, with a coefficient of determination (R²) of 0.852, indicating that the use of the textbook contributed 85.2% to the improvement of students' maharah lughawiyah. Furthermore, the t-test showed that the calculated t value (17.144) was higher than the critical t value (2.008), with a significance value of 0.000 < 0.05, indicating that the alternative hypothesis was accepted. Therefore, it can be concluded that the use of Al-'Arabiyyah Bayna Yadaik is effective and has a significant positive effect on improving the maharah lughawiyah of eighth-grade students at Diniyah Limo Jurai Islamic Boarding School, Agam.]]>
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