Early the next morning, Welch came to the factory again, but when he walked to the blackboard, he was surprised to find that the second team had erased the number 5 written on the blackboard, but changed it. Became a large number 6.The workers of the first shift team certainly saw the big number 6 when they handed over the shift. They thought to themselves, how can they let the people in the second group exceed themselves? If so, doesn’t it mean telling everyone that they are not capable? As a result, they worked hard all the time, and when they were close to get off work, they changed the number on the blackboard into a big 10. In this way, the two teams competed secretly with each other. They were afraid that the other would surpass themselves, so they began to work hard.