Working in groups is hard, and the biggest challenge is getting people working towards common goals. Many groups form without spending any time considering some basic questions, like what their purpose is, or how the goals of the group fit with the goals of the people in the group. _Extraordinary Groups_ presents a framework that can help you understand why understanding these issues is so important, and it provides exercises that you can use to help yourself be a better leader, as well as exercises for the team to use. I got this with the idea of considering the ideas in the context of the various work groups I'm involved in. I realized that the framework is also applicable in other circumstances, including family (why shouldn't you think of the main relationship in your life as an "extraordinary group of 2"), and ad-hoc Facebook issue groups. Definitely work a read.