7 Types of Waste

Classification of the seven types of waste in production systems, as defined by Taiichi Ohno, the father of waste elimination in manufacturing operations, are as follows. Waste is defined as anything that uses resources, but does not add real value to transforming the product or service.

  1. Waste from overproduction.
  2. Waste from waiting or idle time, including a) man waiting on machine, b) man waiting on man, c) machine waiting on man or d) machine waiting on machine.
  3. Waste from unnecessary transportation.
  4. Waste from inefficient processes or over-processing.
  5. Waste of unnecessary inventory or backlog.
  6. Waste of motion and efforts.
  7. Waste from producing defective goods or making corrections.

In recent years, an eighth type of waste was identified, waste from unused creativity (human intellect).

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