Cause Analysis Tools
Cause analysis tools are helpful tools for conducting a root cause analysis for a problem or situation. They include:
Fishbone 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.
Cause Analysis resources
Quality Revolution Reduces Defects, Drives Sales Growth at 3M (PDF) Case study looking at how 3M combined lean Six Sigma and a Top-200 customer focus to improve its belt fabrication processes and reduce defects in parts per million by a factor of 28 times as sales increased by 54%.
Wind Power Company Gets to the Root of an Icy Issue (PDF) Case study of how a root cause analysis project saved Clipper Windpower $1 million in lost revenue while increasing customer satisfaction.
Under Scrutiny (Quality Progress) A new approach to root cause analysis can help clear up misconceptions.
Get to the Root of It (Quality Progress) Use an is/is not comparative analysis tool to pinpoint the problem.
Is There a Relationship Here? (Quality Progress) How a scatter diagram can help you determine if there's a correlation between two variables.
Tools@Work: More New Twists on Traditional Quality Tools and Techniques (PDF) Tips for using Ishikawa diagrams and Pareto charts in non-traditional applications.