One of these principles is time-based management standards, which are incorporated into preparation adapted to different types of supply chain representatives and work personnel. Preparation and training are two extremely important requirements in lean manufacturing that allows the supply chain to eliminate waste and decrease expenses. By preparing staff to run a variety of errands in one of the stores in a supply chain, employee demands and tasks can be kept to a minimum. This technique ensures that employees within the supply chain not only gather information about the entire company, but are able to offer much higher customer service. In “Three Pillars for Building Lean Manufacturing” by Chris and Rick Harris, Harris embraces this importance: “When an organization operates a lean manufacturing system, it is important to understand that the lean manufacturing system is the customer of the supply base. ” (Harris, 2015, p. 28) Personnel expenses can also be reduced as fewer personnel are needed because employees have more experience with obligations throughout the period