This article examines the determinants of the diffusion of team produc
tion systems (modular assembly) and the impact of these systems on fir
m performance relative to traditional assembly systems in the apparel
industry. The article draws on an extensive survey providing detailed
information on a wide range of manufacturing practices and retail rela
tionships in the U.S. apparel industry. We find that recent diffusion
of modular practices is driven primarily by the product market, We als
o show that modular systems affect business-unit performance (particul
arly operating profits) where they are combined with complementary inv
estments in information systems linking apparel suppliers with retail
customers.