|From Experience Factor|
I also believe that employers have a good idea about who they want to hire before the interview takes place. Although, due to logistics they have to interview people that they may not want to hire. Their top picks may take a job elsewhere or turn out to be crazy. I personally think that interviews are important, but not the end-all to getting a job.
This doesn't mean that you should walk into an interview without any prep. There are a ton of good books about interviewing tips. If you haven't read any books on how to ace an interview, I highly recommend doing so.
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