Jidoka
Defects and mistakes are the worst method of wasting as energy to be put into the repairing brings no added value. Therefore, Toyota has developed the concept of Jidoka, or designing equipment and processes in order to be stopped if any problem occurs. This ensures that any lack of quality will be discovered and solved at the place of its occurrence and thus cannot be passed on to the following process. For example, in practice this means that every employee finding any defect on the car can stop the production line in order to prevent the defect being passed on.