Issue 18 of Cooperative Approaches tackles the problem of children and young people at-risk. Roland DAVAL opens the debate with an editorial showing the scale of the problem of children at-risk in today's world, followed by interviews and reports illustrating the responses developed by public authorities and associations in the USA, France, Burkina Faso, Madagascar, Senegal. Innovative initiatives are presented, such as the living environments set up by the Colibri association, the assistance provided to young delinquents in prison by the "Grandir dignement" association, and the work done with street children. The issue closes with Michel Seyrat's "Mercy for children".