" In an interview, the nurse manager explains that a ‘certain level of error will occur’ so a ‘nonpunitive environment’ is essential to deal with this error productively,” Edmondson wrote. “There is an unspoken rule here to help each other and check each other,” a nurse told Edmondson’s assistant. “People feel more willing to admit to errors here, because the nurse manager goes to bat for you. "

― Charles Duhigg , Smarter Faster Better: The Secrets of Being Productive in Life and Business