Often the best candidate for a job is someone already on staff, but that doesn't mean you can be lax about interviewing that person, experts say. One of the most common mistakes? Assuming you already know what you need to know about someone's skill set. "Just because you know someone well doesn't mean you will know if they will be able to perform well in a new job," says Susan Cantrell, senior research fellow at Accenture's Institute for High Performance.

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