Resumen
Modern technological systems are extremely complex, with tens of thousands of variables that have to be considered and accounted for. No designer can create such a complex system without making dozens of mistakes, because humans just aren't that competent. And in some environments, any mistake can be lethal. In order to insure the integrity of their work, engineers must ruthlessly and relentlessly hunt down and eliminate their own errors. They must have a total commitment to the task of cleansing their design of even the smallest flaw. And they must resist the human temptation to take the short view, to say "good enough" too soon. Instead, they maintain an unreasonable persistence and patience, utilizing negative thinking, pessimism, and perhaps, paranoia to assume there are still flaws remaining in the design even when there aren't. Obviously, there is a great tension going on between the archetypal manager and engineer. Managers often accuse engineers of perfectionism, of tinkering with the product instead of finishing it. And in some cases, it's true.