HackerTube / Video
Velocity 2012: Richard Cook, "How Complex Systems Fail"
O'Reilly

Dr. Richard Cook, a physician and patient safety researcher, presents his ideas on how complex systems fail, at Velocity 2012. He argues for designing for resiliency rather than trying to exhaustively handle every failure mode.
HN people recommend it as a must-watch for anyone running complex systems, and some rewatch it regularly to remember its principles.
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