Teacher performance assessment at SMK Darul Khuldi is still conducted manually using printed documents, making the recording, recapitulation, and reporting processes relatively time-consuming and prone to administrative errors and disorganized archiving. In addition, the use of qualitative categories in the assessment process makes the evaluation results difficult to process objectively and quantitatively. This study aims to design and develop a web-based Decision Support System (DSS) for teacher performance assessment using the Weighted Product (WP) method. The WP method is employed to calculate and rank teachers based on several assessment criteria, namely subject matter mastery, attendance, achievements, responsibility, and discipline. The system was developed using the PHP programming language and MySQL database. The results show that the system can automatically calculate assessment scores, generate consistent teacher rankings based on the WP method, and accelerate the assessment process compared with the manual method. Therefore, the developed system can assist the school in improving the efficiency, accuracy, and objectivity of teacher performance assessment at SMK Darul Khuldi.
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