" In his theory Perrow recognized that modern systems are made up of thousands of parts, including fallible human decision makers, which interrelate in ways that are, like Laplace´s atoms, impossible to track and anticipate individually. Yet one can bet on the fact that just as atoms executing a drunkard´s walk will eventually get somewhere, so too will accidents eventually occur. Called normal accident theory, Perrow´s doctrine describes how that happens – how accidents can occur without clear causes, without those glaring errors and incompetent villains sought by corporate or government commission. "

― Leonard Mlodinow , The Drunkard's Walk: How Randomness Rules Our Lives