International audienceThis book is an important contribution for those who wish to understand in detail what youth participation initiatives — formal, non-formal or informal — mean and how they are implemented.The PARTISPACE research made it possible to reveal both a certain number of characteristics common to these initiatives in the various European cities studied, and strong specificities linked to the local areas in which they took place. These specificities refer to local systems that are largely marked by several elements: nation histories; national difficulties, especially young people’s living conditions; the values of national and local public policies in the broad field of social issues and in the more specific field of youth issues; and the state of the relations maintained between public and voluntary actors and with youth associations and groups.Overall, this book provides a detailed understanding of the local mechanisms at work in youth participation, the dynamics that run through the groups of young people who participate, and the professional and voluntary practices of the actors who accompany them. By considering specific examples of the participation of certain groups of young people (political groups, groups of young people seeking asylum, people with experience of street homelessness, feminists, artists, etc.), this book sets out the challenges encountered by the people involved in youth participation initiatives when they mobilise for their cause and local area, despite knowing that they may still experience social abjection. But, above all, the analysis demonstrates the particularly developed mobilisation capacities of these groups, their inventiveness, their solidarity, their acute understandings of their situations, and the importance of the roles they can play both in favour of the young people they represent and more widely of their local area.For all these reasons, reading this book will undoubtedly spark debate on the richness of youth participation initiatives in Europe, and will illustrate how young people are capable of renewing repertoires of action and contributing to the various forms of solidarity needed to face major contemporary challenges such as social, political and climate injustice, poverty, and the denial of human rights