How Big Things Get Done: The Surprising Factors Behind Every Successful Project, from Home Renovations to Space Exploration

by Professor Bent Flyvbjerg

So what did the data show? Not that. The benefit overrun of the average project does not exceed the cost overrun. In fact, there is no benefit overrun.13 Put simply, the typical project is one in which costs are underestimated and benefits are overestimated.