Radical Candor is a simple idea: to be a good boss, you have to Care Personally at the same time that you Challenge Directly. When you challenge without caring it's obnoxious aggression; when you care without challenging it's ruinous empathy. When you do neither it's manipulative insincerity.

Author Kim Scott was an executive at Google and then at Apple, where she worked with a team to develop a class on how to be a good boss. She has earned growing fame in recent years with her approach to effective management, Radical Candor. From the time we learn to speak, we're told that if you don't have anything nice to say, don't say anything at all. When you become a manager, it's your job to say it--and your obligation.