Communities of practice mediate knowledge and learning of a community (Lave and Wenger 2000). Cassidy et al. (2007) identify more specific communities of educational practitioners engaged in enquiry. CEEBL (Centre for Excellence in Enquiry-Based Learning) interacts with several communities of practice. These communities operate at different scales, from national to a specific school and have different levels of specificity, from very general interest in Enquiry-Based Learning (EBL) to a focus on a particular discipline or even being a specific instance of the delivery of EBL. This poster will describe a number of these networks, drawing from participation and observation.