Even the most experienced professionals make mistakes from time to time. There's nothing you can do about it, man is imperfect. But what to do in a situation where a seemingly small mistake can lead to human casualties, as happens with pilots, surgeons, and rescuers? Or to the loss of a lot of money, as in business? A checklist is a unique, simple and inexpensive tool for monitoring critical indicators of each business or process. It is easy to implement, convenient to use, and, as world experience shows, it can significantly reduce the number of errors in various areas of life.