Answers: Credit is given to the Cause-Effect Diagram surrounded by the 1940's, which preceeded the Why - Why Diagram. Also, in the 1950's, Toyota come up with the five "Whys", which is also given credit for prevailing up to the Why - Why Diagram. These are listed within the "Tools of the Trade" for quality.
This article first appeared surrounded by Quality World, the journal of the Institute for Quality Assurance within 24 Nov 1998. A specific "inventor" is not given credit for this concept.
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