To understand how people experience justice and security is a challenging task in times of unrest, marked by growing perceptions of insecurity, discrimination and uncertainty. The European project ALTERNATIVE aimed to understand justice and security experiences related to conflicts in intercultural settings, when citizens are given the means to actively contribute to these processes. This book relates how the project was set up as an action research through the concrete description of four action sites: social housing estates in Vienna, Austria; a small community in Hungary with a Roma population; three border towns in Serbia; and three communities in Northern Ireland. These four sites have been compared through an innovative methodology, which leads to a deeper understanding of the impact of participatory and restorative justice oriented processes, and – in a more general way – of what action research may entail in the criminological field. Bringing together researchers and case studies from around Europe, this book examines the scientific potential of action research as a methodology in criminal justice settings. This book is one of two volumes resulting from the work by a group of researchers in six European countries having cooperated intensively during four years in ALTERNATIVE, an action research project funded under the EU Seventh Framework Programme.