This article deals with the question how technology contributed to the perf
orming of objective assessments of health risks and to the public trust in
the insurance institution. Many authors have pointed to the relevance of me
dical or statistical technology with regard to the constitution of objectiv
ity, because these technologies should be capable of diminishing the influe
nce of social interactions - the "human element'' - on the process of produ
cing knowledge about health risks. However, in this article it is shown tha
t the constitution of objective risk assessments and public trust cannot be
seen as the product of one particular type of technology, but that it is t
he product of a socio-technical network, in which several heterogeneous ele
ments become interrelated and interdependant. The historical reconstruction
of this network also sheds a new light on the role of `the human element'
in the constitution of objectivity and trust. It shows that elements in the
network which regulate the social interaction between the subjects involve
d are of no less importance to generate trust than technologies which tend
to abstract from this interaction. In other words, objective and subjective
elements are intertwined much more than is often recognized, and public tr
ust is to a fairly large degree depends on conventions in social interactio
n.