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Lean & Variation – Understanding The 3 M’s

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I have seen examples of the 3 M’s in many places. I think it is important to understand their interrelationships before starting to implement solutions!

The 3 Msdreamstime_5669182
Muda: Waste – One or more of the 7 types –  (Overproduction, Waiting, Transport, Extra Motion, Extra Processing, Defects, Inventory)

Mura: Variation (unevenness or fluctuation ) in performance

Muri: Hard to do / burdensome (usually caused by Mura and/or Muda)

Examples abound of how the 3 M’s are related. Here are some:

Example >> Poor layout of a facility (indicated by Transport Waste) would lead to “difficulty in getting the job done in a timely manner” which leads to accidents and making mistakes due to always being in a rush

Example >> Unstable process (Variation or Unevenness) – think of situations where equipment is down often – this would create Waste downstream (Waiting, Defects) >> then Muri – hard to do for operators – like sorting / inspection / disposition.

Example >> Searching for tools or information (Extra Motion) would result in less time focusing on value-adding activities which could result in errors.

Example >> Documentation too wordy / confusing  / not visual  (Extra Processing) would result in spending too much time in finding what is needed in a timely manner.

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Columbus, Ohio   USA

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March 2023
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