The article looks at effectiveness in union organization. Following Ch
ild et al. (1973), it describes the necessary conditions for both admi
nistrative and representative effectiveness. Administratively effectiv
e unions focus on an organizable job territory, control costs and avoi
d competition. Representative effectiveness is defined by the degree o
f employer dependence, the balance of services and the degree of centr
alization. We argue that the prevailing tendency for concentration thr
ough merger often damages representative effectiveness while yielding
few administrative benefits. The article concludes by offering a frame
work for analysis of a range of co-operative relationships between uni
ons which yield administrative benefits.