The persistent belief that "this time will be different" is often the single greatest threat to any project's success,and Part of The Bias Files, Adele Ashcombe's insightful book explores why every plan inevitably runs late andover budget.Optimism shifts from a motivating force into a blind spot when initial projections fail to account for inherentuncertainties, turning hopeful estimates into unrealistic expectations. *Behind Schedule, Over Budget* is not a