This ESRC-funded project tested the relationship between size and performance in organisations providing adult social care to see if micro-enterprises outperform larger care providers in delivering services to users that are valued; innovative; personalised and cost-effective. Project findings are of relevance to local authorities, service users and other organisations as they commission care services, and to social entrepreneurs as they develop provision. They also deepen social scientific knowledge of the relationship between organisational size and performance in welfare services, of relevance to academics working in fields such as social policy and public management.