Which of the following is not a principle of Lean methodology?

Lean methodology focuses on optimizing processes by maximizing value while minimizing waste. The principles of Lean include concepts such as Value Stream Mapping, which helps visualize and analyze the flow of materials and information, and Eliminating Waste, which seeks to identify and eradicate any elements that do not add value to the end product or service.

Continuous Flow is another critical aspect of Lean, aiming to maintain a steady progression of work through each stage of the process, thus reducing delays and improving efficiency.

While Lean does address variation in processes, its primary emphasis is not specifically on reducing variation. Rather, this focus aligns more closely with Six Sigma, which targets the reduction of process variability to improve quality. Lean's goals are primarily focused on waste reduction and streamlining processes, making “Reducing Variation” the choice that does not directly align with core Lean principles.