5 Whys
Version 1.0.0 · Updated 2026-07-30
CORE DEFINITION
Questioning: Continuously ask "why" about the problem (usually five times). Digging deeper: Each answer becomes the starting point for the next question. Root cause: Continue until the root cause of the problem is uncovered.
SCAFFOLDING EFFECT
Reduce cognitive load
Penetrate the surface to reach the root cause. Avoid "Band-Aid" fixes that stay at the surface symptoms. Example: Machine stopped → fuse blown → overload → bearing lacks lubrication → lubrication system not regularly inspected → no maintenance plan (root cause). Related variant: Toyota questioning method
Anchor fast decisions
Continuously ask "why" about the problem to peel back the causal chain layer by layer, penetrating the surface to reach the root cause. The mechanism is: most fixes only address symptoms (Band-Aids), but there are deeper causes behind symptoms; each answer to "why" moves up one layer, and about five times can reach an actionable systemic root cause (the number is not a hard rule, depending on the situation).
MINIMUM ACTION
In progress 0/5Practice this model in one real situation:
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/Five_whysverified
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