- and this
- Jon Miller's critique of Eric's Lean Startup book has a long section challenging Eric's version of 5whys.
- Ishikawa Diagram (Fishbone Diagram) This shows why it's not 1*5 nodes, but 3^5 ("243 Whys" would be a harder sell)
- Diagram Of Effects
- MsExcel table http://www.bulsuk.com/2009/07/5-why-analysis-using-table.html
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