The term “lean manufacturing”, (Womack et al., 1990), refers to the generalization of the Toyota Production system (TPS), also called Just-in-Time (JIT). One feature of such system is the reduction of costs through elimination of waste (Sugimori et al., 1977). Waste or muda (in Japanese) is anything that does not add value to a product. Elimination of muda is done by means of continuous improve...