One of the vital elements in operation management is quality management, thus, the purpose of the report is provided an in-depth analysis of the importance of quality management in business, especially in big operations based on the case of Lactalis which known as the global dairy operation with a long history in Australia. Firstly, the report will give detail information about Lactalis company including size, business type, areas of operations, competitors, and so on. Next, the key issue of the firm would be identified related to quality management and the root of the problem coming from the processing failure of the company. Besides, the report also provided a deeper explanation of the topic by providing the definition of quality management and cost of quality along with the practice of quality management in the Lactalis case in order to review how the previous researches the issues. The report also provides both primary and secondary data that was collected from the company report and online survey from 200 Facebook online users. Based on the collected data, quality and quantity analysis will be provided as well as the suggested program will be defined such as series of controlling hazards programs, maintenance programs, pest control programs and additional programs. Finally, the report will discuss how Lactalis can ameliorate the performance with suggested models.