Assembly Line Stress Methods
Toyota constantly stresses their assembly line. They do this on a quest for perfection. They use their very aggressive Continuous Improvement program as one mechanism to do this. Too little stress and you’re not moving ahead aggressively. Too much stress and you’re introducing too much pain to into your system. Just the right amount of stress, and you are forever moving forward as your competitors stray behind.
Assembly line stress is good and this presentation discusses how Toyota does it: