Abstract
The Common Assessment Framework provides a model of early intervention, which is familiar in local authorities throughout England, and asserts a participatory framework of child and family engagement. This paper is based on a qualitative study of parents and children who were subject to a multi‐agency process of early intervention in children’s social care in a local authority in the Midlands of England. I advance the concept of assemblage to consider the basis of an active service user participation as rather more a struggle to achieve than something that has been granted by practitioner agencies. Interview extracts are used to show the enrolment and assembly of participation as a process of service users developing their active human agency in a multi‐agency setting. The article explores the assembling of skills in administration and management of meetings and plans, accessing knowledge and expertise through service user networks, and challenging professional expertise and institutional space while developing personal qualities of confidence and voice as a means of marshalling an effective participation in a multi‐agency setting.