Waste (or muda)

Waste is anything that does not add value to a product or service. Value is anything that brings benefit, as defined by the customer, to a product or service. The Japanese word for waste in Lean operations is muda. Taiichi Ohno described the seven classic types of waste in production operations as:

  1. Inventory
  2. Motion
  3. Waiting
  4. Over-processing
  5. Over-production (WIP)
  6. Defects
  7. Transportation


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