Sophisticated computational technologies enable the development of sup
port systems for architectural design that are meant to facilitate acc
ess to design knowledge. Systems of precedence knowledge are in good c
urrency at present as they are expected to enhance creativity in the e
arly conceptual phases of the design process by interacting with given
design contexts. This paper presents the view that this is a false ex
pectation: the use of precedents is counterproductive with respect to
design creativity. It is proposed that creativity can be promoted by a
rchitectural and other exemplars, but that they are most instrumental
when partial and more ambiguous and manipulable than holistic exemplar
s such as precedents. It is claimed that open-ended computational syst
ems of references have the potential to enhance creative designing, an
d they can do so regardless of the particular culture or micro-culture
within which a designer operates.