Adapted from “The Wall Street Journal Guide to Management” by Alan Murray, published by Harper Business.

Leadership and management must go hand in hand. They are not the same thing. But they are necessarily linked, and complementary. Any effort to separate the two is likely to cause more problems than it solves.

Still, much ink has been spent delineating the differences. The manager’s job is to plan, organize and coordinate. The leader’s job is to inspire and motivate. In his 1989...