OICC Press International Journal of Industrial Chemistry 2228-5547 15 4 2024 11 29 Improving production efficiency by implementing DMAIC phases on the Six Sigma method: a case study on the oil industry 1 26 10.57647/j.ijic.2024.1504.23 EN Hamid Esmaili Department of Industrial Engineering, North Tehran Branch, Islamic Azad University, Tehran, Iran https://orcid.org/0000-0001-8003-8153 Reza Bornak Department of Industrial Engineering, North Tehran Branch, Islamic Azad University, Tehran, Iran Afsaneh Shahrokhi Department of Industrial Engineering, North Tehran Branch, Islamic Azad University, Tehran, Iran Hossein Jadidi Department of Industrial Engineering, North Tehran Branch, Islamic Azad University, Tehran, Iran Journal Article 2024 11 29 High-level competition in business requires improving the quality of the organization’s product or service. Six Sigma with the DMAIC approach is a strategy that has been effective in improving product and service quality, and the concept of ”Six Sigma” as an integrated strategy is still being developed. This article has tried to achieve qualitative and quantitative improvements in the oil production process of an FMCG company by using the Six Sigma method and implementing the DMAIC cycle. Therefore, we will first  examine the basic concepts of Six Sigma, how to implement the DMAIC cycle, and the effective elements of production, and then identify the problems related to reducing stoppages, waste, and completing empty capacities in the oil industry. Finally, we will consider increasing the production capacity to improve the overall effectiveness of the equipment. In the next step, with the help of mental storm sessions, the causes of the stops are investigated, and with the help of cause-and-effect diagrams, Pareto and MINITAB software, the main causes of the problem are identified and effective improvements are suggested.