This study aims to develop and test the feasibility of a "Habituation-Based Arabic Language Center" model, designed as an institutional system to strengthen the Arabic language proficiency of students at Islamic higher education institutions. The study employs a Research and Development (R&D) approach, utilizing a modified 4D model (covering the define, design, and develop stages). The research subjects include students from the 2021 cohort at IAIN Kudus, alongside expert validators consisting of language lecturers and practitioners from language centers. Data were collected using both Arabic proficiency tests and non-test instruments, including observations, questionnaires, and expert validation. Data analysis was conducted using descriptive qualitative methods and descriptive statistics. The results indicate that the model is highly feasible, receiving an 84% validation score from experts and positive feedback from instructors. A trial, based on a pre-experimental "One-Shot Case Study" design, yielded an average score of 75.04 (categorized as B+) with a 90% pass rate. These findings demonstrate that the model is effective in enhancing students' Arabic language proficiency through the systemic integration of habituation, curriculum, and institutional structure.
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