Kim Scott admits she has made some huge mistakes as a boss - mistakes that made her kind of obsessed with becoming a better manager. She's also learned a thing or two from being managed by Sheryl Sandberg, and from teaching managers at Apple to lead. She argues that if you don’t know what you’re doing as a leader, productivity will suffer. The team being managed will suffer. And you and your investors will suffer. Even though lots of companies - especially in tech - used to shrug off management, what we need, she says, is more "radical candor." But that "radical candor" does not give you license to be a jerk; it has to be coupled with kindness, so you're helping your co-workers do the best work of their lives.