Definition
Waste (or Muda in Japanese) is any human activity which absorbs resources but creates no value. In the context of the Toyota Production System, identifying and eliminating waste is the primary mechanism for increasing efficiency and quality.
Why It Matters
Every ounce of waste is a “tax” on your system’s output. In a competitive world, the entity that identifies and eliminates waste fastest wins. Ignoring waste isn’t just inefficient; it’s a slow-motion form of suicide by entropy.
Core Concepts
- The Seven Wastes:
- Transport: Moving products that are not required to perform the processing.
- Inventory: All components, work in process, and finished product not being processed.
- Motion: People or equipment moving or walking more than is required to perform the processing.
- Waiting: Waiting for the next production step, interruptions of production, etc.
- Overproduction: Production ahead of demand.
- Over-processing: Resulting from poor tool or product design creating unneeded activity.
- Defects: The effort involved in inspecting for and fixing defects.
- Value-Added vs. Non-Value-Added: Distinguishing between work the customer is willing to pay for and work that is just “necessary evil” or pure waste.