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!
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.