From the Q&A – i liked this:
“Mike Hurst asked an interesting question about whether the club employed personality and aptitude testing for potential and current players. Wenger said he met personally with every new potential recruit before they were signed. The club tried to learn everything it could about a player. The club had used psychological tests to probe a player’s desire, consistency, ability to co-operate with others and so on. This had been done for six or seven years now.”