Five Whys

Systems Thinking technique (from Toyota) of investigating every defect/surprise to understand Root Cause-s, and to plan appropriate investments to prevent recurrence.

Eric Ries: http://startuplessonslearned.blogspot.com/2008/11/five-whys.html

http://en.wikipedia.org/wiki/5_Whys

Joel Spolsky http://www.joelonsoftware.com/items/2008/01/22.html

http://software.isixsigma.com/library/content/c020610a.asp

visual structure


can also be more general process of challenging assumptions to going to a Meta Level: see Kathy Sierra 2007-03-21-SierraMetaLevel


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