Use these tools when you want to conduct root cause analysis for a problem or situation.
Fishbone (Ishikawa) diagram: identifies many possible causes for an effect or problem and sorts ideas into useful categories.
Pareto chart: shows on a bar graph which factors are more significant.
Scatter diagram: graphs pairs of numerical data, with one variable on each axis, to help you look for a relationship.
Excerpted from Nancy R. Tague’s The Quality Toolbox, Second Edition, ASQ Quality Press, 2004.
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