iarjetIARJETIARJET2708-5163https://doi.org/10.47310/iarjet.2022.v03i01.004Minimizing Labor Cost by Developing Workforce Scheduling Model: A Case StudyMyPhamThiMinhNguyenThanhHienNgocDoThis research focused on improving the workforce scheduling problem at a plastic company. The research developed a computer program to solve two problems: shift scheduling and labor allocation, with the objective of minimizing labor costs, based on the constraints on the number of workers, the number of products, the suitability of each worker and other related constraints. The workforce scheduling program is built on the interface of MS. Excel software, VBA project and Solver, OpenSolver tool. The purpose of the program is to calculate the number of workers required for each working shift so as to optimize costs, then allocate workers to working shifts. The program was built and validated with data from the studied shop floor in 7 months. The results show that the program has arranged workers according to the corresponding shift and the speed of completing the shift schedule has been reduced by 8 times compared to the present, the total labor cost is saving average 15.1% per month. The program meets the set parameters: completion time is reduced, worker response level is increased and the time difference between shifts is less than 40%.