A growing group of investors around the world is seeking to make investments that generate social and environmental value as well as financial return. This emerging industry of impact investing has the potential to become a potent force for addressing global challenges. But how might it succeed or fail? Will its development take the next five to 10 years? 25 years? Or will it not happen at all? And what will it take for the industry to achieve its promise? This executive summary provides an overview of impact investing and how leaders could accelerate its evolution and increase its ultimate impact in the world.