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Ishikawa Fishbone Diagram or Cause and Effect Diagram
Use the Ishikawa fishbone diagram or cause and effect diagram
to identify the special root causes of delay, waste, rework or cost.
Here is a example of the Ishikawa fishbone diagram in the QI Macros
for Excel SPC software.
To complete an Ishikawa fishbone diagram or cause and effect
diagram:
- Put the problem statement in the head of the fish and the major causes
at the end of the major bones. Major causes include:
- Processes, machines, materials, measurement, people, environment
- Steps of a process (step 1, step 2, etc.).
- Whatever makes sense
- Begin with the most likely main cause.
- For each cause, ask "Why?" up to five times.
- Circle one-to-five ROOT causes (end of "why" chain)
- Verify the root causes with data (Pareto or Scatter Diagram)
Common Causes of Variation
Process Cause-Effect Diagram
Each step of the process is a major cause.
Generic Cause-Effect Diagram
People, process, machines, materials, and measurement are the major
causes.
Custom Cause-Effect Diagram
Use the generic categories but adapt them to your process: service
representative, service order, software systems, reference manuals, and
access.
Special Causes of Variation
Manufacturing
Poor quality batches of material
Defective equipment
Untrained operators
Variation in methods
Service Delivery
Process
Support Systems
Materials
Training
The Ishikawa fishbone diagram is just one of the tools included in the QI
Macros for Excel SPC Software for Excel.
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the FREE 30-day Evaluation copy of the QI Macros Excel SPC Software for Six
Sigma
Buy the QI Macros Now! Unconditional, No
Questions Asked, 90-day Money-Back Guarantee!
QI Macros Excel SPC Software for Histograms and Control Charts $139 Plus S&H
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The QI Macros for Excel $139,
is an inexpensive easy to use set of Excel add-ins for statistical process control
and Lean Six Sigma. It draws line, pie, bar, pareto, box whisker, histogram (Cp,
Cpk), scatter and control charts (with stability analysis).
It contains over 70 fill in the blank templates such as the Ishikawa diagram,
QFD, DOE, FMEA, PPAP, and Gage R&R for MSA. Performs ANOVA, t-test, F-test,
and regression analysis.
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