<![CDATA[This research was motivated by the sales process at HIMATEKFORS, Universitas Pendidikan Muhammadiyah Sorong, which was still conducted manually, making the process less efficient and ineffective. The study aimed to develop a web-based sales information system as a medium for product promotion, transaction management, and sales reporting. The system development applied the Waterfall method, which includes the stages of requirement definition, system and software design, implementation and unit testing, integration and system testing, as well as operation and maintenance. The system was developed using PHP Native with MySQL as the database. The available features include user registration and login, product catalog and search, shopping cart, checkout, order history, product management, sales reports, and store information management. Black Box Testing was conducted using 25 testing scenarios, and the results showed that all system functions operated properly with a success rate of 100%. Meanwhile, the System Usability Scale (SUS) testing involving 20 respondents obtained an average score of 77.3, which falls into the Good category. Based on these results, the developed system is expected to improve promotional effectiveness, simplify transaction processes, and assist in managing sales reports at HIMATEKFORS UNIMUDA Sorong. ]]>
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