" The other feature of this list is that many of these signals could easily be viewed as obvious and redundant. For instance, do highly experienced professionals like nurses and anesthesiologists really need to be explicitly told that their role in a cardiac surgery is important? Do they really need to be informed that if they see the surgeon make a mistake, they might want to speak up?
The answer, as Endmondson discovered, is a thundering yes. The value of those signals is not their information but in the fact that they orient the team to the task and to one another. What seems like repetition is, in fact, navigation. "

― Daniel Coyle , The Culture Code: The Secrets of Highly Successful Groups