Five whys
5つのなぜ
causality
eight disciplines problem solving
Five Ws
(information-gathering)
four causes
issue map
Issue tree
root cause analysis
Socratic method
why-because analysis
kawasima
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/kawasima/Five whys
ebiken
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/ebiken/Five whys
mrsekut-p
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/mrsekut-p/The Five Whys
wikipedia
Five whys
weblio
Five whys
kotobank
Five whys
jisho
Five whys