Truckflyer:
I did some research into aptitude tests for my bachelor degree in aviation about a year ago, and our aviation psychology class was taught by one of Norway's most prominent experts (Monica Martinussen,
Psychology, University of Tromso) in this field. I learned that most people seem to have a common misunderstanding of what these tests actually do.
Aptitude tests are primarily developed for military use, and they are not designed to give any specific indication of how well a pilot will perform in the future. These tests are designed to find the candidates with the highest probability of completing training. You might assume that they would also give some indication on how the candidate will perform later on (multi-tasking capabilities etc), but a lot of these skills can be trained or compensated for with experience and so on. These tests do work, but never 100%, and the only goal is to find the best candidates to put through flight training. Period.
It's a bit off topic, but still relevant to your post about SAS pilots.