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We believe that case-based reasoning (CBR) will prove applicable to design, at least in part, as we have seen designers making extensive use of past cases. Construction of useful systems, however, requires the resolution of many open issues. In this paper we consider three issues in particular: (1) What sort of content should be captured in a design case? (2) How should the content of a complex case be segmented into chunks for use? (3) How should the resulting chunks be indexed for retrieval? These are among the issues we are seeking to address through construction of Archie-II, a case-based aid for conceptual design in architecture. In addition to our approaches to these issues, this paper also discusses our strategic choice to build a design aiding system as opposed to a system that generates designs on its own.' In practice, when the volume within some genre is sufficient, designers and even entire design firms develop specialties. Nowadays, there are plenty of architectural firms that have knocked out dozens of condominium complexes or suburban office parks. Yet it turns out that even in such firms, there is often a lack of corporate memory (C. Zimring, personal communication).

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