In Boston we have heard many reporters claim that the delays in the Big Dig (the highways tunneled under the city and the harbor) were increased by contractors stretching out the work to increase their incomes. This suggests that there are strong incentives, particularly in projects paid for through government, to over promise (underbid) and under deliver (negotiate higher pay when work is under way).
Not so much a planning bias as a pocket book bias.
John
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Abraham Pais, one of Einstein's many friends, has said that Einstein loved to joke. Are you sure his "sorry for the good Lord" wasn't a bit of humor?