No one would use these toothbrushes .... “I wrote a serial number on every toothbrush. From today, if you use a toothbrush, please tell someone the number written on the toothbrush.” How to consider how to reduce the risk? Can you share your clothes? reviewing misunderstand process results I respect her. She is willing to take on the tasks that everyone dislikes. But her groundbreaking idea of giving serial numbers to about 10 toothbrushes is a bit strange. No, I would like to admit that it is even stranger that toothbrushes that are not used by anyone have been left unattended for a long time. How to consider how to reduce the risk? Consideration of how to reduce risk is done in a very stupid way. The method is a stupid procedure of reviewing the process from the results. All risks are potential, invisible and untouchable. The risks we can perceive are none other than the reality caused by the risks. Therefore, we misunderstand the...