North American scholars have had an historical interest in the extent
to which workers can be committed to both their employer and their uni
on. This is particularly relevant given the recent emphasis on greater
labor-management cooperation as part of a competitive strategy. This
paper reviewed the correlational literature concerning the relationshi
p between company and union commitment. Meta-analysis procedures were
applied to the results of 76 samples involving a total of 15,699 respo
ndents and found a mean corrected effect size of .42. The extended ana
lyses included multiple studies from Canada, Japan, Sweden, and the Un
ited States. A system-level moderator, adversarial, or consensual appr
oach to industrial relations, was found. While further moderator analy
sis was warranted, studies lacked sufficient information for coding. C
onceptual and practical implications from the findings are drawn.