The 4Ms Model to Name Ishikawa Main Causes

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The 4Ms Model to Name Ishikawa Main Causes
Ćwiklicki, Member
I checked the internet to find out who and when used the original 4Ms as names for the main cause categories (branches). Unfortunatelly I could not find it, even in papers referring to Ishikawa's book from 1982.
Maybe you know when and where this 4M first appeared?

This Technique is Referred as 4M Technique
the Fishbone is also referred to as the 4M model.
The 4 M's are as follows:
- Manpower
- Machinery
- Methods
- Materials
The origin is as not known very clearly but its appearance is understandable because when you're looking at a production system you usually find mistakes broadly in the above 4 categories, even if you proceed in detail you may find other causes. But you will notice also they tend to fall in either of the 4 categories. So we consider them as a base.
But with times people have modified it according to their convenience.

Variants of 4Ms Model
Jaap de Jonge, Editor
@ANUJ KUMAR SHRIVASTAVA: Excellent answer, remember 4M is just a template, a model that is easy to remember. But each individual problem/effect needs individual factors.
Sometimes a bigger number of main cause categories is used, especially when we are outside the domain of manufacturing/production.
One comprehensive variant is 6M+E:
- Manpower
- Machinery
- Methods
- Materials
- Management
- Measurement
- Environment.



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