Multiple humanitarian actors with different objectives, principles and modi operandi intervene in situations of armed conflict and internal violence in order to alleviate the plight of the victims: governmental and non-governmental organisations, international organisations, National Red Cross and Red Crescent Societies and private companies, among others. The diversity of actors and approaches can help to alleviate suffering if they manage to act in a complementary fashion, on the basis of their respective operational abilities. This edition explores the distinctive characteristics of the diverse actors and the need to build and nurture an effective partnership among them.