Single-Minute Exchange of Die is one of the many lean production methods for reducing waste in a manufacturing process. It provides a rapid and efficient way of converting a manufacturing process from running the current product to running the next product. This rapid changeover is key to reducing production lot sizes, stocks of finished products and thereby improving flow (Mura). The concept arose in the late 1950’ s and early 1960’ s when Shigeo Shingo was consulting to a variety of companies including Toyota and was contemplating their inability to eliminate bottlenecks at car body molding presses. The bottlenecks were caused by long tool changeover times, which drove up production lot sizes.