http://www.isixsigma.com/tools-templates/cause-effect/determine-root-cause-5-whys/
https://en.wikipedia.org/wiki/5_Whys
http://www.lifetime-reliability.com/tutorials/lean-management-methods/How_to_Use_the_5-Whys_for_Root_Cause_Analysis.pdf
http://quality-one.com/5-why/
https://www.mindtools.com/pages/article/newTMC_5W.htm
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