When and Why?

Ishikawa Kaoru (1915-1989) developed this diagram while working for Nissan Liquid Fuel. He is known as one of the fathers of quality management in Japan.

The Ishikawa-Diagram was later integrated into the seven quality tools of the Japanese Union of Scientists and Engineers (JUSE) where Ishikawa Kaoru was a member since 1949.

The Ishikawa-Diagram is also known as Fishbone Diagram or Cause-Effect-Diagram. 

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