The CAAD community is lucky indeed to be involved in a field of teaching  and learning which is evolving so fast, which contributes so much to the  theory and practice of that most complex and interesting human activity - design, and which clearly excites such a high level of interest and  commitment from our students. There is much upon which the CAAD community can congratulate itself, each year the proceedings of E C A A D E, A C A D I A, C A A D Futures and now C A A D R I A expose an increasingly rich diversity of applications of the information technologies to architectural education. The purpose of this paper, however, is to highlight the relative paucity of applications which lie at the very centre of design education - i.e. the “cause and effecti of how design decisions impact upon the quality of the building.