Existing survey research in Britain has shown that there are notable d
ifferences between the characteristics of union and nonunion establish
ments. But at the same time case study research has indicated that the
characteristics and employment practices of nonunion organizations va
ry quite widely. In order to try to reconcile these findings, this pap
er presents an analysis of some data contained in the 1990 national Wo
rkplace industrial Relations Survey. The findings reveal that a sizeab
le minority of nonunion establishments have similar characteristics to
unionized establishments which, in turn, make them particularly vulne
rable to union organizing efforts and help account for the fact that i
t is these nonunion establishments which are most strongly opposed to
a possible union presence. The implications of these findings for futu
re research are then discussed.