For more than twenty years, management expert Bruce Tulgan has been asking, “What are the most difficult challenges you face when it comes to managing people?”

Regardless of industry or job title, managers cite the same core issues—27 recurring challenges: the superstar whom the manager is afraid of losing, the slacker whom the manager cannot figure out how to motivate, the one with an attitude problem, and the two who cannot get along, to name just a few.

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