en Occupational and Industrial Health Occupational and Industrial Health پژوهشي Original Article <div style="text-align: justify;"><span style="font-size:14px;"><span style="font-family:times new roman;"><strong>Background:</strong> The construction of metro lines is a high-risk project. Using a budget-based model for the safety units of metro construction projects can help safety managers to spend optimal budget allocation. The purpose of this study was to plan a budget model based on safety unit performance in an under construction metro station for better budget allocation using robust optimization.<br> <strong>Methods: </strong>To design this model, budget dimensions were identified by the experts and based on causes and costs of accidents in the past year. Then, constraints of metro workshops were considered. The next step was involved in determining the importance of each dimension. Finally, the budgeting model was designed using Gurobi software. In order to prove the proposed budgeting model, as a case study, the model was implemented in one of the metro workshops.<br> <strong>Results:</strong> Considering existing constraints, the model revealed that the budget should be at least 4.370.478.000 rials. Surprisingly, the predicted budget amount was less than the expended amount in the safety unit of the project. However, budget allocation to dimensions was dramatically different.<br> <strong>Conclusion:</strong> The results showed that the robust optimization budgeting was functionally and economically optimal. Moreover, there is a need for logical budget distribution.</span></span><br> &nbsp;</div> Safety, Budgeting, Metro construction, Robust optimization 131 137 http://jhehp.zums.ac.ir/browse.php?a_code=A-10-28-13&slc_lang=en&sid=1 Seyed Mahdi Farshadnia farshadnia.mehdi@gmail.com 10031947532846009613 10031947532846009613 No Department of Health, Safety & Enviroment Management, School of Public Health, Zanjan University of Medical Sciences, Zanjan, Iran. Shirazeh Arghami arghami@zums.ac.ir 10031947532846009614 10031947532846009614 Yes Department of Occupational Health and Safety Engineering, School of Public Health, Zanjan University of Medical Sciences, Zanjan, Iran. Ali Shahab Safa mapicioc@gmail.com 10031947532846009615 10031947532846009615 No Department of Project Management Office of Pouyesh Dade Novin, Yazd, Iran. Framarz Majidi fma@zums.ac.ir 10031947532846009616 10031947532846009616 No Department of Occupational Health and Safety Engineering, School of Public Health, Zanjan University of Medical Sciences, Zanjan, Iran.