"The authors also found that while changes in safety regulations could account for some of the excess costs, that was only one of numerous factors contributing to the overages."
"Many of the excess costs were associated with delays caused by the need to make last-minute design changes based on particular conditions at the construction site or other local circumstances, so if more components of the plant, or even the entire plant, could be built offsite under controlled factory conditions, such extra costs could be substantially cut."