Root Cause Analysis

This topic contains 6 replies, has 7 voices, and was last updated by Al 11 years, 10 months ago.

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November 19, 2007 at 10:30 am #48709

Trisha
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Is there any alternative for Fishbone… We have quite a few Projects where RCA is done only thru Fishbone…

Trisha
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November 19, 2007 at 4:52 pm #165067

Jegan Sekar
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You can do an 5 Why Analysis, 3W 1E, 5W 1H analysis.
My take – 5 why analysis is the best because it is easy to understand and implement. But hard to answer every why you ask :)
Jegan Sekar
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December 5, 2007 at 9:35 am #165739

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Hi,
We have lots of tools available for RCA. If you are interested please contact me in abcabc_12000@yahoo.com
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December 9, 2007 at 5:06 am #165904

Burns
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My favorite method of root cause analysis is a variation of an orgizational chart. It’s easy to use and easy for others to understand when used in a presentation.
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December 9, 2007 at 1:53 pm #165910

Deanb
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Trisha,Fishbones and related charts are good at creating dialog around causal possibilities and informing folks “where” the known or alleged causes are located(man, machine, etc). However these often do not show priorities relative to other problems you could or should be solving. Since one of the biggest questions is always “What should we attack next?” I find a ranking system is very useful.I have found FMEAs do the best job of characterizing and ranking priorities. They often zero in on the root causes efficiently too. Adding FMEA RPN scores or priority rankings to the fishbone/charts would give you the best of both worlds.
Good luck.
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December 9, 2007 at 7:11 pm #165915

HF Chris
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5 whys and FMEA’s are only as good as the question asked. It is common to only ask what you know not what you don’t which if not careful can bias your root cause analysis. There are tools that use a structured root cause tree if you search.
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December 11, 2007 at 12:45 pm #165982

Al
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Hi Trisha,
There are many tools available, and it really depends on the problem, which will be most effective. Fishbone is always a good place to start, especially if conducted using effective brainstorming techniques and open dialogue with the correct people to draw out possible root causes. However, it cannot find root cause alone – the tools suggested in other replies are good, esp Repeated Whys and FMEA. Is/Is Not is another effective tool where you are searching for differences between the ‘Is’ (where the problem does exist) and the ‘Is Not’ (where the problem could logically be found, but is not). This can help to rule out or prioritise possible root causes. Another good tool is Y2X matrix (looking at relationships between factors and outputs). I am also a strong believer in simple graphical analysis of the initial data to understand better what is going on and help drill down to possible root causes. Good luck!
Al
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