A quicker explanation, with some background of the technique and criticisms: https://en.wikipedia.org/wiki/Five_whys https://en.wikipedia.org/wiki/Five_whys Pe

A quicker explanation, with some background of the technique and criticisms: https://en.wikipedia.org/wiki/Five_whys https://en.wikipedia.org/wiki/Five_whys Personally, despite the popularity of this technique in the Lean/Agile crowd, I've never found it useful for meaningful problems.