5 Why Analysis
Reference model
The 5 Whys method helps drill down to the root cause of a problem by asking 'why' multiple times.
About this model
A technique developed by Sakichi Toyoda in the early 20th century, used to explore the cause-and-effect relationships underlying a particular problem.
Originator not stated.
How to read it
- Start with the problem statement and ask 'why' it occurs.
- Continue asking 'why' for each answer until the root cause is identified.
What this does
Identifies the root cause of a problem by repeatedly asking 'why' until the fundamental issue is uncovered.
When to use it
Use it when a problem is complex and symptoms are visible, but the underlying cause is unclear.
Not when: Do not use it when the problem is straightforward or when the causes are already well understood.
What happens next
Consider a Fishbone Diagram to visualize potential causes.
Golden thread
Builds on ←
- Problem statement
- Impact assessment
Feeds into →
- Action plan
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Drafted with AI and reviewed by Eccellere on 04/11/2026. Guidance, not advice: apply your own judgement.