The seven wastes a.k.a as TIM WOOD. (Unnecessary) Transport, (Unnecessary) Inventory, Motion, Waiting, Overproduction, Over-processing, and Defects. In short, the Japanese call this MUDA.
I do believe that one of the basic fact about inefficiencies in the workplace is that we are too proud to acknowledge that we might be wrong. We are so afraid to lose face and jeopardise our reputation.