" A great example of Guiding Structure is the “Sterile Cockpit Rule” that the Federal Aviation Administration (FAA) instituted in 1981. Most airline accidents happen below ten thousand feet, where distractions can be deadly. Above ten thousand feet, pilots can talk about anything they want, but below ten thousand feet, the only discussion permitted is about information directly related to the flight in progress. By eliminating distractions, the Sterile Cockpit Rule reduces errors and accidents. "

― Josh Kaufman , The Personal MBA: Master the Art of Business