Job positions select for personality types by whether or not that personality type is generally successful at the job. If a job needs someone who is outgoing a

Job positions select for personality types by whether or not that personality type is generally successful at the job. If a job needs someone who is outgoing and reaches out to others constantly, it's going to tend to select for extroverts, and a job that asks people to work alone for long stretches is going to tend to select for introverts. Not that I believe the results either. I suspect they are fatally flawed in some respect, since most of the programmers I've met have been introverts. (Someone else noted that the study was only among Cubans, for instance.)