Whether in sport or business, writes Lou Dubois, the best performers often also come with the biggest egos. To ensure your star players don't turn into prima donnas and drag down the rest of your team, make sure you don't flatter or reward people any more than is strictly merited by their performance, and try to very tactfully point out the problems the worker is causing. "At the end of the day, you need to re-assert to this prima donna that you still are the boss, and will not allow their behavior," Dubois writes.

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