Progress in the past few decades in representing medical knowledge, al
ong with the availability of low-cost, powerful workstation computers,
has increased interest in encoding all medical records in electronic
form, But despite the advantages of legibility, access, and automated
performance reviews, computerization may also restrict what can be rec
orded and rigidify health care interactions with patients. Balancing t
he beneficial and negative effects requires an understanding of medica
l practice, especially the difference between human knowledge and toda
y's computer programs. Human perceptual and conceptual capabilities br
ing an aspect of improvisation and reinterpretation to every human act
ion, which in general computers today cannot replicate. Designers of m
edical record systems must consider the creative process by which desc
riptions are generated by people, as well as the collaborative process
by which descriptions of past work are reinterpreted for guiding futu
re decisions. This paper provides a framework for understanding these
issues, illustrated by design opportunities.