Diversity is the crucial element for group creativity. Innovation teams tasked with creating new products or technologies or iterating existing ones need tension to produce breakthroughs, and tension comes from diverse points of view.
"How to get started? Take a stubborn challenge you're currently facing and set up an informal meeting with a harsh critic, someone who often disagrees with your point of view. Critics challenge assumptions and are usually very passionate. Invite them in; hear them out. You may be surprised by how much you learn, and also by how thinking about a problem from a different perspective can refresh and energize your own ideas."