3.5 Know what types of mistakes are acceptable and what types are unacceptable, and don’t allow the people who work for you to make the unacceptable ones.
When considering the kinds of mistakes you are willing to allow in order to promote learning through trial and error, weigh the potential damage of a mistake against the benefit of incremental learning. In defining what latitude I am willing to give people, I say, “I’m willing to let you scratch or dent the car, but I won’t put you in a position where there’s a significant risk of your totaling it.”
* Source: Principles by Ray Dalio