Diane Vaughan is a sociologist who specializes in studying how organizations "normalize" deviance. Her study of the Challenger disaster illustrated the concept.
In looking at air traffic controllers at work in four facilities in the Boston Area, she was looking to find how controllers have avoided that trap for the most part. I found the book fascinating, but I was an air traffic controller from shortly after the strike of 1981 until not long before the events of September 2001. In her descriptions of controllers and their work, I recognized my old colleagues (not literally, I worked on the West Coast). How they work and how they describe their work brought back many memories. She was able to get the core of what controllers do and how they do it. They don't keep airplanes from bumping into each other, they keep targets a certain distance apart. Controllers have similar qualities, for better or worse -- they are decisive, impatient, orderly, and problem-solvers.
The section on what happened in air traffic facilities on September 11, 2001, when controllers brought some 4,000 airplanes over U.S. airspace in to land within hours of the attack in New York, was riveting. Just as engrossing was the story of what happened in the days and months following, when airspace boundaries and rules changed daily, and suddenly, a pilot who didn't respond right away was not an inconvenience, but a threat.
Professor Vaughan did most of her research in 2000 and 2001, but did come back in 2017 to see what promised technological changes had been made and how controllers were coping. What she saw was a mixed bag, and we can only hope that FAA suits and congressional lawmakers take note and allocate funds and direct training in ways that change the trajectory to a better outcome.