Originally Posted by Often1

There seem to be a small list of questions and on a random basis, a few questions asked. I have never perceived a pattern or seen anyone taking notes of the answers.

There is usually an unclassified answer to questions which might call for information which might be classified. If CBP let you hang out at that choke point at IAD, you might be surprised to learn that 92% of the people coming through on official passports work in IT or are engineers !