The 5 Whys
The 5 Whys is a structured questioning technique that follows cause and effect to find root causes. By asking “why?” and validating answers with evidence, teams move beyond symptoms to targeted countermeasures. It is simple to learn, scalable and most effective when applied systematically and documented clearly (Serrat, 2017; Gangidi, 2019).
Technique Overview
The 5 Whys Definition
The 5 Whys is a root cause analysis method that investigates a problem by asking “why?” repeatedly until a controllable, evidence-supported cause is identified. It is best used with a clear problem statement, factual data, branching lines of inquiry where needed and verification tests, before implementing countermeasures. Guidance in the literature stresses disciplined application and documentation to avoid single-cause bias (Serrat, 2017; Card, 2017; Gangidi, 2019).
The 5 Whys Description *
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Business Evidence
Strengths, weaknesses and examples of The 5 Whys *
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Business Application
Implementation, success factors and measures of The 5 Whys *
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Professional Tools
The 5 Whys videos and downloads *
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Further Reading
The 5 Whys web and print resources *
The 5 Whys references (4 of up to 20) *
- Benjamin, S.J., Marathamuthu, M.S. and Murugaiah, U., 2015. The use of 5-WHYS technique to eliminate OEE’s speed loss in a manufacturing firm. Journal of Quality in Maintenance Engineering, 21(4), pp.419–435. Available at: https://doi.org/10.1108/JQME-09-2013-0062
- Card, A.J., 2017. The problem with ‘5 whys’. BMJ Quality & Safety, 26(8), pp.671–677. Available at: https://doi.org/10.1136/bmjqs-2016-005849
- Food Standards Agency (2023) Efficacy of Withdrawals and Recalls: Evaluation (Objective 1). London: FSA. Available at: https://www.food.gov.uk/research/efficacy-of-withdrawals-and-recalls-how-effective-was-the-system-redesign-objective-1
- Gangidi, P., 2019. A systematic approach to root cause analysis using 3×5 why’s technique. International Journal of Lean Six Sigma, 10(1), pp.295–310. Available at: https://doi.org/10.1108/IJLSS-10-2017-0114
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