Devops (or SRE etc) is a booming buzzword these days among mammals who run services. One of the things those mammals are rediscovering is that complex systems have complex failures, that all your base are complex systems, and that assuming a single cause of failure is doin it rong. We'll talk about better techniques in incident retrospectives, cool civil engineering disasters, comp.risks, how this is like defense in depth, and why it's awesome when security and reliability teams are pals.