Miftahul Ulum Islamic Boarding School in Kediri currently manages monthly fee payments manually, a process prone to recording errors, delayed balance calculations, and a lack of information transparency for students. This study aims to design and develop a web-based monthly fee payment information system to enhance the efficiency and accuracy of the boarding school's financial management. The Waterfall development method was employed, comprising the stages of requirements analysis, design, implementation, testing, and maintenance. The system was developed using PHP, a MySQL database, and the AdminLTE framework for the user interface. Data collection involved observation, interviews, literature reviews, and questionnaires administered to 20 respondents, consisting of an administrator, a treasurer, and 18 students (users). Black-box testing confirmed that the system functions according to design specifications, while User Acceptance Test (UAT) results indicated satisfaction levels of 96% for the administrator/treasurer and 97.5% for the students/users. Consequently, the development of this system is expected to support the digitalization of fee payment administration, serve as a replacement for manual methods, and improve the accuracy, efficiency, and accessibility of financial information at Miftahul Ulum Islamic Boarding School, Kediri.
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