Great article. I don't think we will ever stop in finding ways of measuring productivity. In a sense, measurement is fundamental as it helps us determine the truth. Look at how important measurement is in the sciences and in engineering.

But the prospect of an employer using previously collected data to make an employment decisions seems rather scary. People do a lot of things when they're young and immature and it seems paranoid to rely on that information when they would probably grow out of it. How accurately can past information predict future productivity? I feel like we can't (yet) measure the effects of external factors on human nature, such as new ideas, new habits, new relationships and so on.