This paper takes a dynamic approach to understanding the nature and role of boundary objects by examining them in relation to the social infrastructures within which they are embedded and to the social identities of the groups that share them. We present a case study that describes the introduction of 3D modelling technologies into the AEC industry and the changes that consequently occurred. Based on the case study we suggest that boundary objects are used not only as a translation device, but also as a resource to form and express social identities. We further suggest the occurrence of a dynamic process whereby changes in boundary objects enable changes in social infrastructures and social identities in one group. These changes, in turn, create the conditions for change in bordering groups through shared boundary objects and boundary practices.