The chapter presents the aims of the volume, notably to provide new knowledge about how young women and men experience and handle job insecurity in Europe. An important focus is the ways in which young adults deal with job insecurity through active agency. We ask how structural factors, including public employment and social services, community networks and families, enable or hamper such efforts. Moreover, we introduce the volume’s analyses of potential adverse long-term consequences of having lived at length with difficulties in finding suitable and stable jobs in young adulthood, specifically: scarring in the form of weaker long-term employment prospects, lower life earnings and reduced well-being. The analyses combine in-depth qualitative studies (life-course interviews), use of large-scale quantitative and comparative data, and an employer survey and factorial experiment. Finally, we present an overview of these methods and key concepts, including well-being, scarring, resilience, active agency and negotiation.