This article explores the process and practice of knowledge creation within development and research (D and R) networks. It focuses upon D and R networks in England that are currently engaged in collaboration and innovation. Early evaluative evidence suggests that D and R school networks offer "spaces" for collaborative working, mutual sharing and active dissemination of knowledge. The evidence also suggests that D and R networks are beginning to positively impact upon instructional practices and learning. The article concludes that these networks have the potential to provide an important infrastructure for co-construction and knowledge creation by schools for schools.