5 Why

5 Why is a questioning technique used in quality management to identify one or more root causes of a problem. The identified root causes should be measurable. 5 Why was developed by Taiichi Ohno (Toyota Production System). It is a simple and effective tool to identify the root causes of a problem. By repeatedly asking “Why” the true causes are uncovered. The number 5 is merely a guideline; sometimes you find the root cause after asking “Why” twice, sometimes after asking ten times.

Goal:
  • Identify causes of problems
  • Understand cause and effect
  • Support of additional tools
  • Developing solutions
Tips:
  • The root cause must be measurable (e.g., in terms of frequency, occurrence, duration, …)
  • If you find multiple causes, select the most important one
  • Avoid clichéd excuses (e.g., forgetting, lack of money, lack of time, …)
Platzhalter

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