The manufacturing engineering work in nine Japanese firms is structured by a horizontal division of labor between manufacturing design engineers and production process engineers, in contrast to a vertical division of labor between manufacturing engineers and technicians in three American firms. The production process engineers in the Japanese firms link manufacturing engineering processes closely with production processes, whereas less coordination between the two processes occurs in the American firms. Regarding product design, manufacturing engineering, and production processes in the Japanese firms, employees engaged in downstream processes are more heavily involved with work concerned with upstream processes than in the American firms.