In the shadow of a failure – and after cleaning the fan – some kind of post-mortem is often requested. The Five Whys is a well-known approach for this kind of analysis and I found myself reading a handful of articles about it recently. I particularly enjoyed the sceptical take on it in these:
- The Infinite Hows by John Allspaw
- Why Not Ask Why? by Don Gray
- How Did You Miss That Bug? by Dan Ashby (including the comments)
Image: Amazon
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