Although technology is often viewed as value-free, an anthropological
perspective suggests that technological tools embody values and assump
tions of their builders. Drawing upon extended field research, this ar
ticle investigates the construction of work in the expert systems comm
unity of artificial intelligence (AI). Describing systematic deletions
in practitioners' representations of their own work the article relat
es these to both the selectivity of conventional knowledge acquisition
procedures and the tendency of expert systems to (in the practitioner
s' words) ''fall off the knowledge cliff.'' Although system builders s
ee the latter problem as purely technical, this article suggests that
it is also the result of nontechnical factors, including the system bu
ilders' own tacit assumptions. This article supports the view that tec
hnology has a cultural dimension.