The implementation of integrity zone initiatives at UPI Purwakarta requires a transparent and accountable complaint management system. However, complaint handling is still conducted through Google Forms and manual processes, which may lead to limited service transparency, delays in handling, and unclear report status for complainants. This condition indicates the need for a system capable of managing complaint processing in a systematic and structured manner. This study aims to design and implement a web-based complaint management system by applying the First In First Out (FIFO) method to ensure that reports are received and processed fairly based on their arrival time. The system was developed using the ADDIE model, consisting of Analyze, Design, Development, Implementation, and Evaluation stages. System evaluation was carried out using black-box testing and the System Usability Scale (SUS). The black-box testing results showed a 100% functional success rate, while SUS testing involving 30 respondents obtained a score of 77.75, which falls into the good and acceptable category. These findings indicate that the implementation of the FIFO method improves the systematic handling of complaints and supports service transparency. This study contributes to the application of time-based prioritization mechanisms to enhance fairness and transparency in complaint management at UPI Purwakarta.
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