Communication and knowledge building are challenging in distributed contexts: participants do not all know each other and work at different times and locations; the number of participants and their organization change during the project; participants belong to different communities. Hence, to deal with the global market place, it is critical to provide teams with distributed collaboration skills and tool support. To improve the collaboration in global software development (GSD), we propose iBistro , an augmented, distributed, and ubiquitous communication space. iBistro aims to overcome problems resulting from miscommunications and information loss in informal or casual meetings. In this paper, we specifically focus on the technical architecture for iBistro, called the distributed concurrent blackboard architecture (DCBA). We developed and tested an experimental prototype of the DCBA between the National University of Singapore and Technische Universität München (TUM),Munich, Germany.