The Computer Supported Collaborative Learning (CSCL) conference has become an internationally-recognized forum for the exchange of research findings related to learning in the context of collaborative activity and the exploration of how such learning might be augmented through technology. This text is the proceedings from CSCL 2005 held in Taipei, Taiwan. This conference marked the 10th anniversary of the first CSCL Conference held at Indiana University in 1995. Subsequent meetings have been held at the University of Toronto, Stanford University, University of Maastricht (Netherlands), University of Colorado at Boulder, and the University of Bergen (Norway).Just as the first CSCL conference was instrumental in shaping the trajectory of the field in its first decade, the conference in Taipei will play an important role in consolidating an increasingly international and interdisciplinary community and defining the direction of the field for the next 10 years. This volume, and the papers from which it is comprised, will be an important resource for those active in this area of research and for others interested in fostering learning in settings of collaboration.