Key points are not available for this paper at this time.
Paul S. Adler, Barbara Goldoftas, David I. Levine, Ergonomics, Employee Involvement, and the Toyota Production System: A Case Study of NUMMI's 1993 Model Introduction, ILR Review, Vol. 50, No. 3 (Apr., 1997), pp. 416-437
Adler et al. (Tue,) studied this question.