This article provides the final report on a research project that investigated the ways in which curriculum innovation can be led successfully in primary schools. Data gathering included 40 semi-structured interviews in 10 successful primary schools in England of varying sizes and types and in a range of geographical and social locations. Findings suggest that in order for curriculum innovation to be successful, school leaders need to create an ethos for change that empowers teachers to experiment with the curriculum through the adoption of distributed forms of leadership, and that in-school and between-school cooperation is a key mechanism for change.