5M1E / Man-Machine-Material-Method-Milieu-Measurement
Updated 2026-08-10
INTRODUCTION
English translation pending.
CORE DEFINITION
The 5M1E framework, widely used in manufacturing quality management alongside fishbone diagrams and root cause analysis, organizes the possible causes of a defect into six dimensions: people, machine, material, method, environment, and measurement. Its core proposition is that a fixed set of independent dimensions prevents the search from stopping at the first plausible cause. The key qualifier is prioritization: the dimensions are a checklist for coverage, not a claim that all six matter equally in a given case.
SCAFFOLDING EFFECT
Reduce cognitive load
- Coverage sweep: walk all six dimensions carefully before settling on any single likely cause. - Candidate listing: write possible causes under each dimension rather than jumping straight to a single one. - Priority ranking: rank the dimensions by evidence so that effort follows likelihood, not habit.
Anchor fast decisions
Diagnosis tends to stop at the first plausible explanation, and the first explanation is usually whichever dimension the team habitually blames. A fixed list forces attention across dimensions that would otherwise be skipped, and writing candidates under each one separates evidence from assumption. The list does not find the cause, but it prevents the search from ending early.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/Ishikawa_diagramverified
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