Alsing [lead architect] thought that even under the best circumstances, several kinds of fear attend a debugging. One was the fear of “The Big Mistake”, the one that would be discovered late in the game and would require a major redesign–and with it perhaps a fatal delay. There was “the flakey fear”: that they’d designed [the machine] and were debugging it in such a way that it would never be reliable or easy to build in large numbers. [They] had that one fairly well in hand. But there was also “the bogeyman fear”. “Just something dark and nameless,” said Alsing, “that the machine just won’t ever work.” “It’s the infinite page fault you didn’t anticipate. The bogeyman is the space your mind can’t comprehend.”