Facebook, who is paying a lot of people to optimize its hiring processes, has found a correlation between the objective of "lower short-term attrition / first-year PIPs" and "quiz people about the mesh size of the goal net." I'm not saying it's the best long-term or that I agree with false positive bit as a business decision, but I find it hard to believe they're doing stuff like this just because they feel like it without any data to back it up.