Definition of Waste:

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. W1 – Overproduction
  2. W2 – Iventory
  3. W3 – Waiting
  4. W4 – Transportation
  5. W5 – Motion
  6. W6 – Process (useless steps in a process)
  7. W7 – Defects.
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