In an era of booming global interdependence, complex problems such as climate change, energy availability, and HIV/AIDS and other worldwide pandemics cannot be solved by a single leadership unit or sector of society. In this groundbreaking book, four senior managers of the global consultancy Booz Allen Hamilton reveal a new approach for leaders to manage such issues: reaching across national and sector divisions and forming collaborative "megacommunities" that are directed toward a common goal. Megacommunities shares the success stories of such collaborations already at work today, with examples from tackling monopolies to urban revitalization to conservation efforts. Leaders around the world are looking to megacommunities to achieve balance between organizational differences and to optimize cooperative efforts.