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Fishbone Diagram (also called Ishikawa diagrams or cause-and-effect diagrams) are diagrams that show the causes of a certain event.
âThe Basic Seven.â. Quality pros have many names for these seven basic tools of quality, first emphasized by Kaoru Ishikawa, a professor of engineering at Tokyo University and the father of âquality circles.â. Start your quality journey by mastering these tools, and you'll have a name for them too: indispensable.. 1  Cause-and-effect diagram (also called Ishikawa or fishbone chart): Identifies many possible causes for an effect or problem and sorts ideas into useful categories.