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The car didn’t start just because the battery is dead, but the car wouldn’t start because maintenance was not kept up by the owner. Because the owner did not follow the recommended service scheduleĪs shown from the example, the true root of the problem is identified after the question why is asked five times.Because the belt was not replaced when worn.Because the serpentine belt has broken.Because the alternator is not working properly.Here is an example of completing a fishbone diagram by using the five whys: The fishbone diagram method is used to truly get to the bottom of an issue by using a process where you ask why five times in order to get to the root cause of a problem. Each bone of the fish going down represents a “Why” in the analysis method, ending up at the head of the fish, symbolizing the true root of the problem. Starting at the top of the diagram pictured on the left, the tail of the fish represents the main problem or issue that is trying to be solved. This diagram is used in Root Cause Analysis and is a visual representation of the 5 Why’s strategy. The Fishbone Diagram, formally named the Ishikawa diagram, is a tool for managers to get to the root cause of an issue in production. Kaizen Lean Manufacturing Continuous Improvement show all tags