Nerval's Lobster writes: "A presidential campaign is many things to many people: a reason to hope in the future, a wellspring of jokes and debate fodder, an annoyance to tune out, a chance to participate in the civic process. But for a couple dozen software engineers and developers involved over the past two years in President Obama’s re-election effort, a campaign was something entirely different: a billion-dollar tech startup with an eighteen-month lifespan and a mandate to ship code under extreme pressure. Speaking to a New York City audience, some of Obama for America’s leading tech people—those involved in the all-important Dashboard and Narwhal projects, as well as fundraising and DevOps—characterized the experience as “insane,” filled with unending problems and the knowledge that, at the end of the whole process, nearly everything they worked on would likely end up tossed away. This is the story of what happened, and how technologies on a massive scale can make or break campaigns." Link to Original Source
Computers are unreliable, but humans are even more unreliable.
Any system which depends on human reliability is unreliable.