Cause and Effect diagram

The cause-effect diagram (also called fish bone diagram) was created by the Japanese scientist Kaoru Ishikawa in the early 1940s.

With a cause-effect diagram, you are able to collect causes in a team. Possible causes are illustrated graphically and act as a possibility to detect root causes.

Influencing factors:

  • human being
  • material
  • machine
  • method
  • measurement equipment
  • contemporaries


The cause-effect diagram shows in a graphical way, which possible causes may influence an occurrence. It serves as root cause analysis after incidence of errors has been localised.


  • fast results by group dynamics
  • easily usable as sample


  • interdependency is not is not considered
  • weighting could be difficult



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