“Waste not, want not” is a timeless saying that captures the essence of this session. By minimizing waste, we can conserve resources, time, and creativity, allowing us to focus our efforts and innovations on areas that drive progress.
The elimination of waste is a fundamental principle of Lean process improvement. Let’s examine the three categories of waste.
Muda
Muda, a Japanese term for waste, was first identified by Taiichi Ohno, who outlined seven types of waste, though additional categories have emerged with evolving manufacturing practices. Ohno’s original wastes include:
- Overproduction (creating more than necessary)
- Unnecessary motion
- Excess inventory
- Unneeded processing steps
- Excessive transportation
- Waiting and idleness
- Defects
Muri
Muri refers to the overburdening of resources, whether human or machine. This overstrain can lead to issues related to safety, reliability, and quality.
Mura
Mura signifies unevenness, where individuals may experience periods of idleness followed by times of overwork. Addressing this imbalance through leveling (heijunka) is essential and serves as one of the pillars of the Toyota Production System (TPS) framework.
