This volume constitutes the proceedings of the First International Workshop on - operative Buildings (CoBuild'98) - Integrating Information, Organization, and Ar chitecture, held in Darmstadt, Germany, on February 25-26, 1998. The idea for this workshop and actually the term "cooperative building" was created during the activi ties of initiating the consortium "Workspaces of the Future" for conducting an inter disciplinary R&D program in cooperation with partners from industry. We discovered that there was no appropriate forum to present research at the intersection of informa tion...