In my experience, it's not accurate to say outright lying is a driving force behind bad estimates. Estimates are actually a difficult problem. "Padding" an esti

In my experience, it's not accurate to say outright lying is a driving force behind bad estimates. Estimates are actually a difficult problem. "Padding" an estimate is not a lie, it's a tool to be more accurate in the aggregate, because it helps account for the 1 in X instances where a task is significantly more time-consuming than you ever could have reliably estimated.