“All models are wrong; some models are useful.”
Quote by W. Edwards Deming
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“Postulate 2. Constant systems of chance causes do exist in nature.”
“Postulate 3. Assignable causes of variation may be found and eliminated.”
Source: Statistical Method from the Viewpoint of Quality Control
“Improvement usually means doing something that we have never done before.”
“The best approach is to dig out and eliminate problems where they were assumed not to exist.”
