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

by Professor Bent Flyvbjerg

In total, only 8.5 percent of projects hit the mark on both cost and time. And a minuscule 0.5 percent nail cost, time, and benefits. Or to put that another way, 91.5 percent of projects go over budget, over schedule, or both And 99.5 percent of projects go over budget, over schedule, under benefits, or some combination of these.