Ulumando, M.I. 2026. Prediction Of Repeating Object-Oriented Programming Course for Informatics Students at ITAF Kupang Using Extreme Gradient Boosting (XGBoost). PERFECT: Journal of Smart Algorithms. 3, 2 (Jun. 2026), 70–83. DOI:https://doi.org/10.62671/perfect.v3i2.285.