Yostian Ari Sujarwo and Samidi 2025. Project Management and Cost Optimization in QR Code-Based Parking Reservation System Development: A PERT, Monte Carlo and PMBOK Approach. Ultima InfoSys : Jurnal Ilmu Sistem Informasi. 16, 1 (Jun. 2025). DOI:https://doi.org/10.31937/si.v16i1.4170.