At toyota, when we want to do kaizen on the line, first we test to prove that the kaizen is really going to bring a benefit to area. Then we check to see that it will not cause an imbalance in the line. When there is an imbalance, we need to redistribute the activities between operator, which may generate another another change in the standard work instructions. This is the way standardized work is not easy to do, and why so many companies have their procedures in a binder ••• to avoid seeing that they need to make revisions.