Book excerpt: HauptbeschreibungDelivering humanitarian aid has become a complex issue in contemporary politics and practice. The expansion of the humanitarian field caused by an increasing number of humanitarian actors and international donors - such as the EU, the United States, and the United Nations - leads to new questions concerning complex coordination, legitimacy, and accountability. These changes in the humanitarian arena, the so-called "New Wars", and advances in international law confront humanitarian actors with additional challenges. In turn, such changes require a professionalization of aid in.