This article discusses two cases, Germany and The Netherlands, whose s
ystems of trade unionism have historically shared a number of characte
ristics, in particular a commitment to industrial unionism. In both co
untries a profound transformation of union organization is under way,
affecting in particular the demarcation of union domains; the relation
ships between unions with respect to their division of representationa
l territory and organizational jurisdiction; and the relationship betw
een unions and their peak associations. It does not appear that this p
arallel transformation of union systems is a consequence of the growin
g interdependence between industrial nations. To the extent that we ob
serve identical developments in different countries, they seem to be c
aused by identical endogenous factors resulting in convergence but in
the absence of diffusion or other forms of mutual causation.