Definition of Waste:

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Waste in a process is any activity that does not result in moving the process closer to the final output or adding value to the final output.

The main wastes are seven (7W):

  1. Overproduction
  2. Inventory
  3. Waiting
  4. Transportation
  5. Motion
  6. Process (useless steps in a process)
  7. Defects
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