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Besides, as it happens with everything in life, it's hard to please everyone. And Six Sigma is no different. The truth is that there are many critics who have been questioning the wisdom of relying a lot on Six Sigma. Joining these critics are business owners who have failed to implement this approach within your organization.
A Brief History Of Six Sigma
When you look at Six Sigma at a high level, you need to keep in mind that it uses the DMAIC (define, measure, analyze, improve, and control) cycle to eliminate process variation. This way, you should reduce product defects since you are making all processes predictable and consistent. Obviously, this would lead to substantial cost quality reductions for the ones implementing it.
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The reality is that when multi-billion dollar companies decided to use Six Sigma within their organizations, these companies were able to save billions of dollars.
Statistically speaking, a Six-Sigma level of quality should theoretically achieve 99.9997% yield and equate to 3.4 defects per million opportunities. If these numbers make you raise an eyebrow and wonder precisely where these figures come from, you are not alone in your skepticism. Without delving into the intricacies behind the mathematics too deeply, Six Sigma statistical methods hinge on a standard deviation of plus/minus 1.5, the "Six-Sigma shift." As such, the fundamental veracity of its statistical presumptions has been questioned time and time again.
The Main Criticisms Of Six Sigma Today
While many companies (both large and small) have already experienced success when they implemented the Six Sigma method, the reality is that not all have succeeded. And there are some main criticisms that are made to the Six Sigma approach.
The main criticisms of Six Sigma today include:
#1: Six Sigma as a one-dimensional philosophy:
These are the basic Lean Six Sigma metrics.
#2: Six Sigma as a short-sighted business approach:
#3: Six Sigma as an outsourced service:
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