5 Whys
Ask “why” until you reach a cause you can act on. It may take fewer than five, or a few more.
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STEP 1
STEP 2
Ask why
Up to 7. Stop when the answer is something you can change.
STEP 3
Root cause and action
Is it a root cause?
Read the chain backwards with “therefore”. If every step still makes sense, and fixing the last answer would stop the problem, you have reached it.