How are the Super Bowl referees chosen?

The referees have been in the news this week - and here's who the officiating crew are who will work on Super Bowl 59 in New Orleans. In case you're interested, the referees are an all-star team and are chosen on the basis of their performances throughout the season. A group of former officials and coaches evaluate the referees on every call they make on every play throughout the season and give them a grade.