Collaboration is the watchwordfor developmental continuity, and is explored here for a range of actors involved in child development, including children themselves, their parents, ECEC and primary school staff, and community services. The chapter draivs on a survey of OECD countries and partner countries to outline key trends across jurisdictions, as well as similarities and differences. It describes five main challenges highlighted by participating countries that are hindering developmental continuity, along with a wealth of practical strategies for tackling them.