This book sheds light on why and how new humanitarian actors engage in humanitarian action and how their humanitarian activities are perceived in their (transnational) organisational environment. It provides detailed international and empirical comparisons between the ‘new’ humanitarians and traditional humanitarian actors, in particular those which focus on the relative level of commitment to humanitarian principles. It thus elucidates the role of the humanitarian principles in promoting coherence and coordination in the crowded and diverse world of humanitarian actors.