Tools for Finding Root Cause?

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Which tool is preferable in Six Sigma methodology to detect or find the root cause from special cause variation and then solve accordingly? And how to differentiate if the tool is suitable to use for common cause variation or special cause variation? Thanks for your help... (...) Read more? Sign up for free

Consultant, Netherlands

Check Data

I would say that you could check the data using a histogram. If the RC mentioned does not appear regularly / more than once in a larger period of time, it would most likely be a special cause variation.
Next to that I would recommend to always ask the employees who participate in the process: if they have been working within that process for quite some time, they will be able to judge and advise if it's common cause or special cause variation.
To statistically see the difference, you can use a control chart (minitab).
Outliers (above or under the ucl/lcl) need to be investigated and prevent it from happening again.
Note: process should be stable and predictable in order to recognise valid outliers.
Hope this helps, good luck!

  Pashupati Nath verma
Professor, India

Cause-effect Diagram & Relationship Diagram

Cause-effect diagram, also known as Fishbone diagr (...)


Problem Solving

Thank you Miranda. I would conclude the histogram (...)

  Mike Watson
Manager, United Kingdom

Ishikawa Diagrams

I find Ishikawa valuable and use it a lot in my wo (...)

  Jagdish B Acharya
Consultant, India

A Mix of Techniques Depending on Problem

Statistics can point out that the problem is due t (...)

  Cristian Bleotu

Tools for Finding Root Causes

Hi Amran, basically you've got the answer from mir (...)

  Gary Westerdale
Management Consultant, United States

Software Tools for Finding Root Causes

Two tools for root cause analysis are; - Taproot (...)


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