Fish-bone Diagram is a quality tool that identifies many possible causes for an effect or problem.

It can be used to structure a brainstorming session. It immediately sorts ideas into useful categories, helps teams explore and display the causes contributing to a certain effect or outcome.

It graphically displays the relationship of the causes to the effect and to each other, helping teams identify areas for improvement.
The Fish-bone Diagram is also known as cause and effect diagram or an Ishikawa diagram, for its creator.

https://www.youtube.com/watch?v=387chd8p54c

When to Use?

Identifying possible causes for a problem or an outcome.
Categorising brainstorm ideas about problem causes.

How to Use?

Form a team of individuals who have a knowledge of the area under analysis

Agree on a problem statement (effect). Write it at the center-right of the flipchart or whiteboard. Draw a box around it and draw a horizontal arrow running to it.
Brainstorm the major categories of causes of the problem. If this is difficult, use generic headings:
- Methods
- Machines (equipment)
- Manpower (People)
- Materials
- Measurement
- Mother Nature (Environment)
Write the categories of causes as branches from the main arrow.
Brainstorm all the possible causes of the problem.
Ask: “Why does this happen?” As each idea is given, the facilitator writes it as a branch from the appropriate category.
Causes can be written in several places if they relate to several categories.
Tip: Develop the causes by asking “Why?” until you have reached a useful level of detail.
Write sub–causes branching off the causes.
When the group runs out of ideas, focus attention to places on the chart where ideas are few.

Materials Needed:

Flipchart or whiteboard and marking pens.

Source:

www.ahrq.gov
www.asq.org
Institute for Healthcare Improvement - QI Essentials Toolkit

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