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5 Whys |
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This method is to ask why an event happened and place the resulting
answer in the cause chain. Each question should be simple, short,
focused on a single question and starting with "Why...?" After each
cause has been identified, the next question to ask is "Why did this
event happen?" |
Example
of 5 Whys
Problem
Statement: Gage was found in use on shop floor beyond its calibration
date.
Why was a gage in use beyond its calibration date?
Because the gage was not recalled and the operator did not check
the calibration label. |
Why was the gage not recalled?
Because the gage was not on the recall list.
Why was the
gage not on the recall list?
Because the gage was just recently purchased.
Why are new
gages not added to recall list?
Because there is no procedure or specific
training
on purchasing gages.
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Why did the
operator not check the label?
Because the operator was recently hired and had not been trained
to check calibration labels.
Why wasn't
the operator trained to check labels?
Because on-the job training does not specify and it was overlooked.
Why
doesn't OJT address calibration labels?
Not considered a priority by supervisors.
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Please note that in this example, the 5 Whys came to a logical and
root cause solution in 4 Whys. Generally speaking, 5 Whys will get
you there, but sometimes it will be more, and sometimes less.
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