This proposal seeks to bring together scholars, policymakers and advocates from a number of European jurisdictions and the United States to address the relationship between their jurisdictions' juvenile and adult criminal justice systems and consider how their response to crime could be rendered more coherent and effective across those two systems. Recent advancements in research in developmental psychology, neuroscience and criminology have led to reforms in youth justice systems that are less harshly punitive and more effectively designed to engender pro-social development. But these reforms have also sharpened the divide between youth and adult justice systems, undermining the coherence and effectiveness of a jurisdiction’s overall response to crime. The aim of this project is to create an opportunity for cross-justice systems discussions that ordinarily do not occur, to explore opportunities for inter-system collaboration. Facilitating discussions across jurisdictions will be particularly valuable, both because this comparative approach has driven productive reforms in the past, and because there is considerable variety across jurisdictions in response to adult crime. The project would begin and end with a roundtable style conference at the IIRP, with site visits occurring at juvenile and adult facilities in some of the participating jurisdictions in between those two conferences.