Family vulnerability is a growing problem across the OECD. Vulnerable families and children are disproportionately affected by the current economic downturn and their number is growing in many OECD countries. Attempting to respond to these concerns, several countries have taken measures to address the complex needs of this group by bringing different services together. Drawing on these integrated family service initiatives across the OECD, this chapter seeks to answer the following questions: how are services integrated within existing family welfare structures? Are joined-up family services effective in preventing cycles of disadvantage and social exclusion? This review finds that different forms of integrating service delivery have the potential to improve service-use outcomes for families with multiple needs. The lack of robust evidence on the (cost) effectiveness of these initiatives, however, hinders long-term investment and upscaling of existing initiatives.