November 15, 2006 |

Another Example of Why 5-Why’s / Fishbone Diagrams are Bad Root Cause Analysis Systems

See this link for an example of 5-Why’s applied to a problem:

http://www.reproline.jhu.edu/English/6read/6pi/ppt/maqpi/gifs/slide17.gif

I’m not posting this as a particularly bad example of 5-Whys. Rather it is a rather typical example of 5-Whys.

If that isn’t bad enough, look at this Fishbone Diagram:

http://www.reproline.jhu.edu/English/6read/6pi/ppt/maqpi/gifs/slide16.gif

Any TapRooT® User who views this example will know how much is missing from either root cause analysis.

But others may think that the answers presented are OK – maybe even way better than their current analysis.

That’s why I shake my head when someone mentions 5-Whys or Fishbone Diagrams as a root cause analysis tools. It appears to be better but it just leads people down the road to the same old ineffectice answers that they always seem to get. It doesn’t get people beyond their current thinking.

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