Tools for Finding Root Cause in 6 Sigma

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Tools for Finding Root Cause in 6 Sigma

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...


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 diagram, proposed by Ishikawa, helps in identifying roo... Sign up


Problem Solving

Thank you Miranda. I would conclude the histogram and control chart are able to detect and different... Sign up

Mike Watson
Manager, United Kingdom

Ishikawa Diagrams

I find Ishikawa valuable and use it a lot in my work in the aircraft industry. However I would cauti... Sign up

Jagdish B Acharya
Consultant, India

A Mix of Techniques Depending on Problem

Statistics can point out that the problem is due to assignable causes but cannot tell anything about... Sign up

Cristian Bleotu, Romania

Tools for Finding Root Causes

Hi Amran, basically you've got the answer from miranda and jagdish: 1. Identify special cause varia... Sign up

Gary Westerdale
Management Consultant, United States

Software Tools for Finding Root Causes

Two tools for root cause analysis are; - Taproot - Apollo Both have methodologies and associated ... Sign up


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