http://www.inc.com/magazine/20071101/how-hard-could-it-be-five-easy-ways-to-fail.html?partner=fogcreek]Software development takes immense intellectual effort. Even the best programmers can rarely sustain that level of effort for more than a few hours a day. Beyond that, they need to rest their brains a bit, which is why they always seem to be surfing the Internet or playing games when you barge in on them.
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