This duality, making yourself better while teaching and developing others' judgment capabilities, is the key to leadership that is both productive and principled.

Leaders wonder about everything, want to learn as much as they can, are willing to take risks, experiment, try new things. They do not worry about failure but embrace errors, knowing they will learn from them.

Leaders should always expect the very best of those around them. They know that people can change and grow.

Ineffective leaders often act on the advice and counsel of the last person they talked to.

That's important to remember: it's not just a collection of great individuals but a group of people who enjoy playing in the sandbox, thoroughly enjoying collaborative problem solving.

All of great leaders evidence four basic qualities that are central to their ability to lead: adaptive capacity, the ability to engage others through shared meaning, a distinctive voice, and unshakeable integrity. These four qualities mark all exemplary leaders, whatever their age, gender, ethnicity, or race.

Great groups give the lie to the remarkably persistent but incorrect notion that successful organizations are the lengthened shadow of a great woman or man. However, each great group has a strong leader. In fact, great groups and great leaders create each other.