Per Gallen wrote on Jan 5, 2004: "I also very much agreee with you that prediction of use is an essential component of designing. (And one of the Philosophy of Design that I plan to explore myself: how is such preciction possible? How can it be explained epistemologically?)" Dear all to compliment Per's contribution, i would suggest "Design, Time, not knowing" by our friend Wolfgang Jonas Design Philosophy Papers, issue 5, 2003. it can be read here free until the next issue appears or through subscription. www.desphilosophy.com best wishes for the new year. rosan