This study aims to describe the principal's strategies in planning and implementing educational quality improvement programs and to identify supporting and inhibiting factors in their implementation. Educational quality improvement remains a major challenge in elementary education, particularly in areas experiencing disparities in educational achievement. The research employed a qualitative approach using a best-practice case study design conducted at SD Negeri Tansang-Ansang, Pujut District, Central Lombok Regency. Data were collected through observation, interviews, and documentation involving the principal, teachers, educational staff, school supervisors, school committee members, and parents. Data were analyzed using the Miles and Huberman interactive model, including data reduction, data display, and conclusion drawing. The findings reveal that educational quality planning was conducted through the formulation of SMART-based school goals, data-driven planning using Education Report Card indicators, stakeholder involvement, competency-based task distribution, and work-team formation. Strategy implementation focused on strengthening literacy and numeracy, character education, improving instructional quality through academic supervision and teacher professional development, creating a safe and inclusive school climate, and conducting continuous evaluation and follow-up actions. Supporting factors included harmonious relationships among teachers, diverse professional experiences, and strong instructional leadership of the principal.
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