Archived from the original (PDF) on Novem. Public Affairs Division, Toyota Motor Corporation. ^ "The 'Thinking' Production System: TPS as a winning strategy for developing people in the global manufacturing environment" (PDF)."5-whys Analysis using an Excel Spreadsheet Table". Ask it all the time, ask it any day, and always ask it three times in a row. ^ "Ask 'why' five times about every matter".Method, Applications, Root Causes, Countermeasures, Poka-Yoke and A3. Toyota production system: beyond large-scale production. To avoid these issues, Card suggested abandoning the five whys and instead use other root cause analysis tools such as fishbone or lovebug diagrams. The five whys is based on a misguided reuse of a strategy to understand why new features should be added to products, not a root cause analysis.The artificial depth of the fifth why is unlikely to correlate with the root cause.Card also criticized the five whys as a poor root cause analysis tool and suggested that it be abandoned entirely. Tendency to isolate a single root cause, whereas each question could elicit many different root causes.Results are not repeatable – different people using five whys come up with different causes for the same problem.
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