In contemporary society, most individuals, and especially leaders and managers in organizations, are confronted with complex decision problems on a daily basis. Decisions become complex when they are distributed and unstructured, so that a single decision maker relying solely on her own knowledge has little chances to solve it properly. This is true in various contexts, ranging from small private companies to large public institutions. Nowadays, the sustainability of business models and growth of organizations depend on their capability to make good decisions and ultimately to solve those highly complex problems.