5 Whys

The vehicle will not start. (the problem)

  1. Why? – The battery is dead. (first why)
  2. Why? – The alternator is not functioning. (second why)
  3. Why? – The alternator belt has broken. (third why)
  4. Why? – The alternator belt was well beyond its useful service life and not replaced. (fourth why)
  5. Why? – The vehicle was not maintained according to the recommended service schedule. (fifth why, a root cause)

http://en.wikipedia.org/wiki/5_Whys

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