This book, in contrast with previous research and popular discussions that focus on the productivity of workers, identifies the critical influence of supervisors and engineers as key drivers of productivity differentials. To do so, it analyzes productivity at a Japanese car component plant and its three offshoot plants located in the United States, Thailand, and China and how productivity evolved at these plants from the mid-1990s to the early 2010s. The author’s participatory observation approach reveals that productivity and work practices converged to a limited degree over the years at all four plants.