CAAD Futures is a biennial Conference that aims to promote the advancement of Computer Aided Architectural Design in the service of those concerned with the quality of the built environment. The conferences are organised under the auspices of the CAAD Futures Foundation. The series of conferences started in 1985 in Delft, and has since travelled to Eindhoven, Boston, Zurich, Pittsburgh, Singapore, Munich, Atlanta and Tainan. This book is a special publication of papers from the CAAD Futures 2005 conference which took place at Vienna University of Technology, June 20-22, 2005. Papers selected for this publication were required to be innovative and original, and to present rigorous, high-quality research and development work.