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7 QC Tools: Cause and Effect diagram (Video Tutorial)

What is a Cause and Effect diagram?

  • Root cause finding technique
  • Shape of the diagram is like the bone structure of a fish, hence it is also known as fishbone diagram
  • The effect is placed on the arrowhead of central horizontal line and the causes are showcased by the arrows associated with the central arrow 
  • Named after Professor Kaoru Ishikawa, hence also known as Ishikawa diagram

Why does the Cause and Effect diagram use as a qc tool?

  • Helps in finding and elimination of root cause responsible for the effect or problem
  • Inspires the team to brainstorm till the elimination of root cause
  • Creating Cause and Effect diagram is an education itself
  • Serves as a guide for discussion and frequently inspires more ideas
  • Once created, acts as a record of your research
  • Displays current level of understanding of the team

How to draw the Cause and Effect diagram and how does it help in finding the root cause?

  • Draw a horizontal line in the middle of the paper from left to right, then write the problem or effect on the arrowhead
  • Now draw the associated arrows to the central horizontal line and write the major cause categories responsible for the effect on the tails of associated arrows
  • Now draw the small arrows associated to each major cause category arrow and write the sub-causes under each major cause category
  • Continue practicing the cause and effect diagram until you do not find the root cause of the problem and when root cause has found and eliminated, Place the cause and effect diagram at a place in the plant or office, where it can be visible by everyone in the organization

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