Riccardo Lucchini is Professor Emeritus in Sociology at the University of Fribourg (Switzerland) where he has been Vice-Rector (1971-1975), Head of the Faculty of Economic and Social Sciences (FSES) (1984-1985), President of the Commission on Teaching Evaluation (1999-2003) and Chair of the Department of Social Sciences in FSES (2001-2003). He has carried out extensive research in Germany, Italy, Portugal, Brazil, Uruguay, Mexico, Costa Rica and Honduras on topics ranging from the sociology of facism, drug dependency, children living on the streets and domestic violence, on which topics he has published widely. Daniel Stoecklin is Associate Professor in Sociology at the Centre for Children’s Rights Studies of the University of Geneva (Switzerland). His areas of research and teaching are the sociology of childhood, children’s rights, children in street situations, child participation and the capability approach. Following his PhD on children in street situations in China, he has been involved with several international NGO projects in the field of children in difficult situations. He has also worked as an independent expert for the Council of Europe regarding child participation.