Kaoru Ishikawa, has to be credited with the mother of all quality improvement tools the Ishikawa diagram, which falls under the larger cause and effect diagram umbrella. This helps you to carry out a thorough analysis of the situation. The technique uses a diagram-based approach for thinking through all of the possible causes of a problem. Cause and Effect Diagram, in other words, Ishikawa or Fishbone diagram. Professor Kaoru Ishikawa created Cause and Effect Analysis in the 1960s. But IMO the father of quality management, Dr. There are a number of productivity and management tools used in business organizations. Just as the main categories (Equipment, People, etc.) are highlighted by placing a circle or box around them, if you include sub-categories in your cause-and-effect diagram, circle the sub-category so you can distinguish between categorization vs. When it comes to quality improvement, most of us are probably aware of some of the most effective tools, namely the control chart, run chart, histogram, scatter diagram and flowchart. Using the fish bone diagram loosely may result in a combination of the two approaches as the group oscillates between categorizing different causes and asking "Why?" or "Why else?".Īlthough I've never seen any reference for this technique, I use the following rule to distinguish between categorization vs. Investigate: Now that you've come up with possible causes, it is time to go gather data to confirm which causes are real or not.Ĭommon Categories in a Fishbone Diagram The M'sĮffect: Light Bulb Burning Out PrematurelyĪ tree diagram, probability tree, or root cause analysis is geared more towards thinking in terms of causality, while using a fishbone diagram tends to make people think in terms of categorization.But, you could still ask "Why was he/she not wearing gloves?" with the possible response "There were none available." It is a lot easier to take action against the inventory problem than just the generic "improper handling". "Improper handling" is not a root cause, while "Failing to wear Latex gloves" might be closer to a root cause.
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