[lbriner]

There are plenty of "soft factors" at work in being successful or not. Confidence adds a lot of perceived value to an individual; their ability to work smart instead of just hard; their ability to prove they can do well in the specific context of their job rather than just be generally intelligent but not practical; their ability to make others look good or feel confident in their ability will make them get promotions sooner.

There are obviously lots of practical conditions outside of our control such as local conditions, state of the job market, being willing to relocate etc. There is also the understanding that you need to look better than the other applicants rather than just look good in isolation.

Another major issue that is rarely covered is personality types and the fact that insecurity, paranoia or other physical conditions that are obvious to the interviewer will cause you to look bad, regardless of whether they actually measure your ability to do a job.

And then there's luck!