The evaluation of everyday multi-professional intervention to safeguard and promote the well-being of vulnerable children is limited and restricts both operational planning and professional intervention. The aim was to contribute to the development of a platform that will support better understanding of routes from intervention to outcomes for vulnerable children through utilising administrative datasets and longitudinal research. A series of seminarsrought together international experts in longitudinal studies, policy-makers, software providers, analytical services and representatives of key professional disciplines to discuss a mechanism for establishing the infrastructure for more effective routine data collection about child well-being in Scotland. The key question is: What needs to be in place to ensure that data that is routinely collected about children and families on a national and local basis can be collated, cross-referenced and used as an indicator of the impact of intervention? The seminars also explored the contribution of well-designed longitudinal research. The intention is to identify the core constituents of a robust longitudinal design that would be fit for the evaluation of the efficacy of everyday professional intervention aimed at improving the lives of vulnerable children. The intention is to explore the type and range of data that is required to capture fundamental aspects of everyday multi-professional intervention and child wellbeing. On the basis of this we can identify the most appropriate measures to capture intervention and child well-being and develop a robust analytical package for capturing outcomes over the short, medium and longer term.