" The term pilots use to describe this type of short-burst communication is notifications. A notification is not an order or a command. It provides context, telling of something noticed, placing a spotlight on one discrete element of the world. Notifications are the humblest and most primitive form of communication, the equivalent of a child’s finger-point: I see this. Unlike commands, they carry unspoken questions: Do you agree? What else do you see? In a typical landing or takeoff, a proficient crew averages twenty notifications per minute. "

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