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The Ishikawa diagram, also known as a fishbone or cause-and-effect diagram, is a quality tool for identifying the causes of a particular problem. It visualizes the various factors that can contribute to an effect.

  • Problem analysis: Identification and structuring of the causes of a problem.
  • Visualization: Graphical representation of the cause-effect relationships.
  • Categorization: Classification of causes into different categories (e.g. human, machine, material).


  • Clarity: Clear visualization of complex relationships.
  • Root cause identification: Systematic identification of problem causes.
  • Problem solving: Support in the development of targeted measures.
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