This volume constitutes the proceedings of the "Second International Workshop on Cooperative Buildings (Co Build’99) – Integrating Information, Organizations, and Architecture" held at the Carnegie Museum of Art in Pittsburgh on October 1-2, 1999. The success of the First International Workshop on Cooperative Buildings (Co Build’98), held at GMD in Darmstadt in February 1998, showed that there is a demand for an appropriate forum to present research about the intersection of information technology, organizational innovation, and architecture. Thus, it was decided to organize a follow-up event. The decision of where to organize Co Build’99 was straight forward. Since we had many high quality contributions from the United States (U. S. ) presented at Co Build’98, we wanted to hold the second workshop in the U. S. reaching out to a large audience and at the same time turning it into an international series of events held in different places in the world. Due to the excellent work carried out at Carnegie Mellon University, it was an obvious choice to ask Volker Hartkopf from the Department of Architecture and Jane Siegel from the Human Computer Interaction Institute to be conference cochairs for Co Build’99. The workshop is organized in cooperation with the German National Research Center for Information Technology (GMD), in particular the Integrated Publication and Information Systems Institute (IPSI) in Darmstadt providing continuity between the events.